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Backpack

Backpack

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A backpack is, in its simplest form, a cloth sack
Sack
A sack is a bag, especially a large one for carrying or storing goods.Sack may also refer to:* Quarterback sack, a tackle of the quarterback behind the line of scrimmage in American and Canadian football* Sack , an Irish band...

 carried on one's back and secured with two straps that go over the shoulder
Shoulder
The human shoulder is made up of three bones: the clavicle , the scapula , and the humerus as well as associated muscles, ligaments and tendons. The articulations between the bones of the shoulder make up the shoulder joints. The major joint of the shoulder is the glenohumeral joint, which...

s, but there can be exceptions. Lightweight types of backpacks are sometimes worn on only one shoulder strap.

Backpacks are often preferred to handbag
Handbag
A handbag, or purse in American English, is a handled medium-to-large bag that is often fashionably designed, typically used by women, to hold personal items such as wallet/coins, keys, cosmetics, a hairbrush, pepper spray, cigarettes, mobile phone etc....

s for carrying heavy loads or carrying any sort of equipment, because of the limited capacity to carry heavy weights for long periods of time in the hand
Hand
A hand is a prehensile, multi-fingered extremity located at the end of an arm or forelimb of primates such as humans, chimpanzees, monkeys, and lemurs...

s. Large backpacks, used to carry loads over 10 kg (22 lbs), usually offload the largest part (up to about 90%) of their weight onto padded hip belts, leaving the shoulder straps mainly for stabilising the load. This improves the potential to carry heavy loads, as the hips are stronger than the shoulders, and also increases agility and balance, since the load rides nearer the wearer's own centre of mass
Mass
Mass can be defined as a quantitive measure of the resistance an object has to change in its velocity.In physics, mass commonly refers to any of the following three properties of matter, which have been shown experimentally to be equivalent:...

.

In ancient times, the backpack was used as a means to carry the hunter's larger game and other types of prey as a way of easier transport. In the cases of larger hunts, the hunters would dismember their prey and distribute the pieces of the animal around, each one packing the meat into many wrappings and then into bags which they placed on to their backs. The bag itself was made up of different animal hide and skin (depending on what sorts of animals were in the area) and sewn together by the intestines of said animals, which were woven together tightly to make a sturdy thread-like material.

Terminology


The word backpack was coined in the United States in the 1910s. moneybag and packsack were used before; they now occur mainly as regionalism
Dialect
The term dialect is used in two distinct ways, even by linguists. One usage refers to a variety of a language that is a characteristic of a particular group of the language's speakers. The term is applied most often to regional speech patterns, but a dialect may also be defined by other factors,...

s. The word rucksack is a German
German language
German is a West Germanic language, related to and classified alongside English and Dutch. With an estimated 90 – 98 million native speakers, German is one of the world's major languages and is the most widely-spoken first language in the European Union....

 loanword
Loanword
A loanword is a word borrowed from a donor language and incorporated into a recipient language. By contrast, a calque or loan translation is a related concept where the meaning or idiom is borrowed rather than the lexical item itself. The word loanword is itself a calque of the German Lehnwort,...

 mainly used in the UK
United Kingdom
The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

 and in the US Army: in German 'der Rücken' means 'the back' (the part of the body), and Sack for bag. The name Rucksack is cognate with Danish Rygsæk, Norwegian Ryggsekk, Dutch Rugzak, Afrikaans Rugsak and Swedish Ryggsäck. Alternative names include Haversack
Haversack
A haversack is a bag, usually carried by a single shoulder strap. Although similar to a backpack the single shoulder strap differentiates this type from other backpacks. There are exceptions to this general rule.-Origins:...

, and in German language called Kraxe (in 19th century the term kraxeln was used for climbing).

Backpacks can often simply be referred to as "packs", especially in outdoors contexts; though sometimes ambiguous compared to other bags such as saddlebag
Saddlebag
Saddlebags are bags that are attached to saddles.-Horse riding:In horse riding, saddlebags sit in various positions, on the back, side, or front of the saddle. Most attach to the saddle by straps and ties. They can be made from various materials. Although leather was the traditional material, it is...

s and duffel bag
Duffel bag
A duffel bag is a large cylindrical bag made of cloth with a drawstring closure at the top....

s, context is generally sufficient for identification.

A backpack fitted with pocket(s) that are suspended on the wearer's front side (chest) and loaded in such a way that the load in the front and the load in the back are about equal is called a bodypack. The majority of the load on a bodypack is carried by the hips.

The ideal load carrying system should not disturb the wearer's natural posture, balance and movement of the body. The load must be dispersed onto the skeletal structure in a balanced way, and should not produce forces on the body forward, aft, right, or left.

Backpack designs


Backpacks in general fall into one of four categories: frameless, external frame, internal frame, and bodypack. A pack frame, when present, serves to support the pack and distribute the weight of its contents across the body more appropriately, by transferring much of the weight to the hips and legs. Most of the weight is therefore taken off the shoulders, reducing the chance of injury from shoulder strap pressure (many backpacks equipped solely with shoulder straps can affect the posture of a person carrying more than 14 kg (30 lbs)), as well as being less restrictive of the upper body range of motion. Most backpacks are capable of being closed with either a buckle
Buckle
The buckle or clasp is a device used for fastening two loose ends, with one end attached to it and the other held by a catch in a secure but adjustable manner. Usually overlooked and taken for granted, the invention of the buckle has been indispensable in securing two ends before the invention of...

 mechanism, a zipper
Zipper
A zipper is a commonly used device for temporarily joining two edges of fabric...

, or a dry-bag type closure though a few models use a drawstring fitted with a cord lock
Cord lock
A plastic cord lock attaches to drawstrings and tightens without the use of knots. Cord locks allow mountaineers to fasten clothing and camping equipment quickly in cold conditions when the fingers are encased in heavy gloves. They consist generally of three parts: a barrel, a toggle , and a spring...

 for the main compartment.

Frameless


The simplest backpack design is a bag attached to a set of shoulder straps. Such packs are used for general transportation of goods, and have variable capacity. The simplest designs consist of one main pocket. This may be combined with webbing
Webbing
Webbing is a strong fabric woven as a flat strip or tube of varying width and fibres often used in place of rope. The name webbing comes from the meshed material frequently used in its construction, which resembles a web...

 or cordage straps, while more sophisticated models add extra pockets, waist straps, chest straps, padded shoulder straps, padded backs, and sometimes reflective materials for added safety at night. These packs are generally produced inexpensively.

Some outdoor packs, particularly those sold for day hikes, ultralight backpacking
Ultralight backpacking
Ultralight backpacking is a style of backpacking that emphasizes carrying the lightest and simplest kit safely possible for a given trip. Base pack weight is reduced as much as safely possible, though reduction of the weight of...

 and mountaineering are sometimes frameless as well.

The safety of some of the designs of these backpacks have been criticized by the UK NHS
National Health Service
The National Health Service is the shared name of three of the four publicly funded healthcare systems in the United Kingdom. They provide a comprehensive range of health services, the vast majority of which are free at the point of use to residents of the United Kingdom...

, many bag designs being deemed "unsafe" for children.

External frame packs




External frame packs were designed carry heavy loads (>20 kg or 40 lb), giving the wearer more support and protection and better weight distribution than a simple, frameless strapped bag. Wooden pack frames were used for centuries around the world. Ötzi the Iceman
Ötzi the Iceman
Ötzi the Iceman , Similaun Man, and Man from Hauslabjoch are modern names for a well-preserved natural mummy of a man who lived about 5,300 years ago. The mummy was found in September 1991 in the Ötztal Alps, near Hauslabjoch on the border between Austria and Italy. The nickname comes from the...

 may have used one in Copper Age
Copper Age
The Chalcolithic |stone]]") period or Copper Age, also known as the Eneolithic/Æneolithic , is a phase of the Bronze Age in which the addition of tin to copper to form bronze during smelting remained yet unknown by the metallurgists of the times...

 Alpine Italy , though some archaeologists believe the frame found with the body was part of a snowshoe
Snowshoe
A snowshoe is footwear for walking over the snow. Snowshoes work by distributing the weight of the person over a larger area so that the person's foot does not sink completely into the snow, a quality called "flotation"....

. Such packs are common in military
Military
A military is an organization authorized by its greater society to use lethal force, usually including use of weapons, in defending its country by combating actual or perceived threats. The military may have additional functions of use to its greater society, such as advancing a political agenda e.g...

 and mountaineering
Mountaineering
Mountaineering or mountain climbing is the sport, hobby or profession of hiking, skiing, and climbing mountains. While mountaineering began as attempts to reach the highest point of unclimbed mountains it has branched into specialisations that address different aspects of the mountain and consists...

 applications ; metal versions first appeared in the mid-20th century.

The frame of an external frame pack is typically made from aluminum, other lightweight metal alloy, and recently reinforced synthetic polymers or plastic
Plastic
A plastic material is any of a wide range of synthetic or semi-synthetic organic solids used in the manufacture of industrial products. Plastics are typically polymers of high molecular mass, and may contain other substances to improve performance and/or reduce production costs...

 and is equipped with a system of straps and tautly-stretched netting which prevents contact between the metal frame and user's back. In addition to comfort, this "stand-off" provides the additional benefit of creating air circulation between the frame and the wearer's back. For this reason, external frame packs are generally considered to be a "cooler load" than internal frame designs. External frame packs have a fabric "sack" portion which is usually smaller than that of internal frame packs, but have exposed frame portions above and below the sack to accommodate attachment of larger items. In addition, the sack can often be removed entirely, permitting the user to customize the configuration of his load, or to transport a non-conventional load such as a quartered game animal. Military packs are often external frame designs due to their ability to carry loads of different shapes, sizes and weights.

Internal frame packs


The internal frame backpack is a recent innovation, invented in 1967 by Greg Lowe, who went on to found Lowe Alpine
Lowe Alpine
Lowe Alpine is an outdoor equipment manufacturer and supplier that originated in Colorado and is now an international company. The company is currently owned by ....

 and Lowepro
Lowepro
Lowepro is a global brand of professional carrying solutions for cameras, laptops, imaging accessories and portable consumer electronics with corporate headquarters in Petaluma, California North Bay Business Journal. January 10th, 2011...

, companies specializing in backpacks and other forms of carrying bags for various equipment. An internal-frame pack has a large fabric section around an internal frame composed of strips of either aluminum, titanium or plastic, sometimes with additional metal stays to reinforce the frame. A complex series of straps works with the frame to distribute the weight and hold it in place. The internal frame permits the pack to fit closely to the wearer's back and minimizes shifting of the load, which is desirable when participating in activities that involve upper-body movement such as scrambling over rocky surfaces and skiing. However, the tight fit reduces ventilation, so these type of packs tend to be more sweaty than external frame packs. The internal construction also allows for a large storage compartment; a few lash points (including webbing loops and straps for sleeping bags and other large items) may be present, but as the frame is completely integrated, it is difficult to securely lash larger and heavier items which do not fit inside the compartment to the outside of the pack. Internal frame packs originally suffered from smaller load capacity and less comfortable fit during steady walking, but newer models have improved greatly in these respects. In addition, because of their snug fit, the improved internal frame models have largely replaced external frame backpacks for many activities.

Daily use


In many countries, backpacks are heavily identified with student
Student
A student is a learner, or someone who attends an educational institution. In some nations, the English term is reserved for those who attend university, while a schoolchild under the age of eighteen is called a pupil in English...

s, and are a primary means of transporting educational materials to and from school. In this context they are sometimes known as bookbags or schoolbags. The purchase of a suitably fashionable, attractive, and useful backpack is a crucial back-to-school ritual for many students.

Typical school backpacks generally lack the rigid frame of an outdoor-style backpack and include only a few pockets in addition to the main storage compartment. While traditionally very simple in design, school backpacks are often made with padded shoulder straps and backs as well as additional reinforcement to hold large numbers of heavy textbooks, as well as safety features such as reflective panels to make the wearer of the pack more visible at night. Padded waist straps may also be provided to distribute weight across the body.

Backpacks are sometimes worn as fashion accessories, in which they perform the same function as a purse. Some such backpacks designed specifically for women are no larger than a typical purse, and are generally associated with younger women.

Special-purpose backpacks



Some backpacks are specifically designed to carry certain items. Common examples include backpacks for small valuable items such as laptop
Laptop
A laptop, also called a notebook, is a personal computer for mobile use. A laptop integrates most of the typical components of a desktop computer, including a display, a keyboard, a pointing device and speakers into a single unit...

s and camera
Camera
A camera is a device that records and stores images. These images may be still photographs or moving images such as videos or movies. The term camera comes from the camera obscura , an early mechanism for projecting images...

s (see photo); backpacks designed to hold laptop computers in particular generally have a padded compartment to hold the computer and medium sized pockets and flaps to accommodate accessories such as charger cables and cordless/corded mice. These are especially common in college and university settings. In order to supply these devices with electricity, a few high-end backpacks are equipped with solar panels.

There are also single-strap packs that are essentially a hybrid between a backpack and a messenger bag.

Inexpensive, very simple packs that combine the drawstring and straps into a single piece of cloth or webbing are occasionally sold for use at sporting events and the like. Some high-end retailers (notably Apple Stores) use a similar design for their shopping bags as well.

Rolling backpacks are backpacks with wheels on the bottom and an extending handle. Because of their design, rolling backpacks reduce the strain on the user, though the shoulder straps may be used to carry the pack for short distances when the terrain is not suitable for wheels. Rolling backpacks are most commonly used while traveling by airplane or train.

Professional use


Backpacks are a standard part of the load-bearing equipment of soldiers, especially infantry
Infantry
Infantrymen are soldiers who are specifically trained for the role of fighting on foot to engage the enemy face to face and have historically borne the brunt of the casualties of combat in wars. As the oldest branch of combat arms, they are the backbone of armies...

, in most countries, and military-style packs are regularly available to civilians in military surplus
Military surplus
Military surplus are goods, usually matériel, that are sold or otherwise disposed of when no longer needed by the military. Entrepreneurs often buy these goods and resell them at surplus stores. Military surplus rarely includes weapons or munitions, though they are occasionally found in such stores...

 stores. Well-known examples include the United States ALICE field pack
All-purpose Lightweight Individual Carrying Equipment
The All-Purpose Lightweight Individual Carrying Equipment, or ALICE system, was adopted as United States Army Standard A on 17 January 1973 to replace the M-1956 Load-Carrying Equipment [LCE] and M-1967 Modernized Load-Carrying Equipment [MLCE]. ALICE gear is still in some limited use in the US...

 and the British Army PLCE
Personal Load Carrying Equipment
Personal Load Carrying Equipment is the current tactical webbing system of the British Army. It consists of a belt, yoke and a number of pouches. Associated with PLCE webbing is a series of other similar load carrying equipment and rucksacks .The purpose of PLCE is to hold everything a soldier...

 rucksack attachment, both of which are widely available to civilian markets both as actual military surplus (new or used) and as replicas. Such packs are often, though not always (e.g. the USMC's
United States Marine Corps
The United States Marine Corps is a branch of the United States Armed Forces responsible for providing power projection from the sea, using the mobility of the United States Navy to deliver combined-arms task forces rapidly. It is one of seven uniformed services of the United States...

 ILBE
ILBE
The Improved Load Bearing Equipment or ILBE is a United States Marine Corps program that includes individual load carriage equipment, individual hydration systems and individual water purification. Since the rucksack was the first part of the program issued to Marines, the ruck is commonly...

 pack), external-frame packs, with the pack itself lashed or pinned
Cotter pin
A split pin, also known in U.S. usage as a cotter pin or cotter key, is a metal fastener with two tines that are bent during installation, similar to a staple or rivet. Typically made of thick wire with a half-circular cross section, split pins come in multiple sizes and types.The British...

 to a metal or plastic carrying frame. For units that are entering combat situations, packs may be loaded heavily and can weigh in excess of 100 lbs. Each soldier may carry extra weapons, ammunition, rations, medical supplies, tents or other shelter material, and extra clothing.

Many police tactical units, as well as players of military-style combat games such as paintball and airsoft, use military-style backpacks and webbing for storing gear and ammunition. There is also a small but thriving industry devoted to creating historical reproductions of military gear; such companies generally produce period-appropriate uniforms and other gear in addition to backpacks.

Some more recent military/tactical designs, especially the MOLLE
Mölle
Mölle is a locality situated in Höganäs Municipality, Skåne County, Sweden with 725 inhabitants in 2005.It is best known for its scenic harbour and its location adjacent to the Kullaberg Nature Reserve...

 and ILBE
ILBE
The Improved Load Bearing Equipment or ILBE is a United States Marine Corps program that includes individual load carriage equipment, individual hydration systems and individual water purification. Since the rucksack was the first part of the program issued to Marines, the ruck is commonly...

 packs used by the United States armed forces, are covered with webbing loop attachment points for increased carrying capacity.

Backpacks for travel


Backpacks are sometimes used as luggage
Luggage
Baggage is any number of bags, cases and containers which hold a traveller's articles during transit.Luggage is more or less the same concept as "baggage", but is normally used in relation to the personal luggage of a specific person or persons Baggage is any number of bags, cases and containers...

, particularly as carry-on bags for airplane travel.

Backpacks form an essential part of the gear of the outdoor trekker and the urban backpacker, allowing more mobility and compactness than would be available to someone carrying most of their gear and clothing in a suitcase
Suitcase
A suitcase is a general term for a distinguishable form of luggage. It is often a somewhat flat, rectangular-shaped bag with rounded/square corners, either metal, hard plastic or made of cloth, vinyl or leather that more or less keeps its shape. It has a carrying handle on one side and is used...

.

In addition to their use in outdoors pursuits, backpacks are sometimes used in other sports as well. Hydration pack
Hydration pack
A hydration pack is a type of hydration system built as a backpack or waist pack containing a reservoir or "bladder" commonly made of rubber or flexible plastic. The reservoir contains a capped mouth for filling with liquid and a hose that allows the wearer to drink hands-free...

s, sometimes used by athletes and military personnel, carry water (in either a bladder or a rigid bottle) and have a tube connected to them from which the wearer can drink without removing the pack; this feature is also included in some more general-purpose hiking backpacks. Backpacks that carry skateboard
Skateboard
A skateboard is typically a specially designed plywood board combined with a polyurethane coating used for making smoother slides and stronger durability, used primarily for the activity of skateboarding. The first skateboards to reach public notice came out of the surfing craze of the early 1960s,...

s have also become more popular in the youth culture.

Backpacks for outdoor activities



One common special type of backpack (sometimes referred to as a "technical pack" or "frame pack") is designed for backpacking
Backpacking (wilderness)
Backpacking combines the activities of hiking and camping for an overnight stay in backcountry wilderness...

 and other outdoors activities. These type of packs are more complex than most other backpacks. Compared to backpacks used for more day-to-day purposes such as schoolbooks, such packs are designed to carry substantially heavier loads, and as a result most such packs attach not only at the shoulders but at the hips, using a padded hip belt to evenly distribute the weight of the pack to the legs and back for better balance and comfort (this is a must for long hikes and extensive trips through trails.) The often heavily padded and sometimes semi-rigid shoulder straps are mainly for balancing the weight. They usually (except for those used in ultralight backpacking
Ultralight backpacking
Ultralight backpacking is a style of backpacking that emphasizes carrying the lightest and simplest kit safely possible for a given trip. Base pack weight is reduced as much as safely possible, though reduction of the weight of...

) have a metal or plastic frame to support and distribute the weight of the pack. Larger packs of this type tend to have a subdivided main compartment. These trekking packs often have several pockets on the outside; they may also have lash points on the exterior (either directly attached to the frame or webbing
Webbing
Webbing is a strong fabric woven as a flat strip or tube of varying width and fibres often used in place of rope. The name webbing comes from the meshed material frequently used in its construction, which resembles a web...

 loops), so that bulky items may be strapped on, although depending on the pack design and type of trek most backpackers will try to stuff everything into the pack. Multiday packs typically have a content between 60 and 100 litres (and are about 3 ft /1 metre tall). Smaller packs with similar features are available for shorter trips.

The most common materials for such packs are canvas
Canvas
Canvas is an extremely heavy-duty plain-woven fabric used for making sails, tents, marquees, backpacks, and other items for which sturdiness is required. It is also popularly used by artists as a painting surface, typically stretched across a wooden frame...

 and nylon
Nylon
Nylon is a generic designation for a family of synthetic polymers known generically as polyamides, first produced on February 28, 1935, by Wallace Carothers at DuPont's research facility at the DuPont Experimental Station...

,(polyester), either ripstop
Ripstop
Ripstop fabrics are woven fabrics often made out of nylon, using a special reinforcing technique that makes them resistant to tearing and ripping. During weaving reinforcement threads are interwoven at regular intervals in a crosshatch pattern. The intervals are typically 5 to 8 millimeters...

 fabric for lightweight packs or heavier fabric such as cordura
Cordura
Cordura is the brand name for a collection of fabrics used in a wide array of products including luggage, backpacks, pants, military wear and performance apparel. Cordura fabrics are known for their durability and resistance to abrasions, tears and scuffs....

 for more typical usage. Most such packs are purpose-designed for the outdoors market; however, it is not uncommon for military surplus
Military surplus
Military surplus are goods, usually matériel, that are sold or otherwise disposed of when no longer needed by the military. Entrepreneurs often buy these goods and resell them at surplus stores. Military surplus rarely includes weapons or munitions, though they are occasionally found in such stores...

 packing gear to be sold to outdoorspeople as well for the same purpose. The cheaper versions of the outdoor packs are often favoured by city trekkers; as they have a large volume and still carry relatively easily.

Outdoors packs, in addition to the distinction between external-frame and internal-frame, can be further subdivided based on the duration of trip a pack might be expected to be used on; daypacks hold supplies for a single day's hiking (size about 20-30 litres), while "weekender" bags can hold two to three day's worth of gear and supplies (sizes about 40-50 litres). Larger packs generally have no specific names but are designed to distribute the weight of increased numbers of gear and supplies for longer-duration trips (60-100 litres); such packs often include complex ergonomic support features to simplify the carrying of large amounts of weight. A third type with little or no frame at all, similar to the bookbags used by students and made of light fabric (often nylon ripstop, as mentioned above), is used in ultralight backpacking
Ultralight backpacking
Ultralight backpacking is a style of backpacking that emphasizes carrying the lightest and simplest kit safely possible for a given trip. Base pack weight is reduced as much as safely possible, though reduction of the weight of...

 to eliminate the weight of the frame and heavy fabric used in more typical outdoors packs. Despite (or perhaps because of) their lesser weight, such packs are seldom less expensive than more typical, regular-weight packs.

In addition, outdoors packs are designed for specific purposes such as kayak
Kayak
A kayak is a small, relatively narrow, human-powered boat primarily designed to be manually propelled by means of a double blade paddle.The traditional kayak has a covered deck and one or more cockpits, each seating one paddler...

ing/canoe
Canoe
A canoe or Canadian canoe is a small narrow boat, typically human-powered, though it may also be powered by sails or small electric or gas motors. Canoes are usually pointed at both bow and stern and are normally open on top, but can be decked over A canoe (North American English) or Canadian...

ing, rock climbing
Rock climbing
Rock climbing also lightly called 'The Gravity Game', is a sport in which participants climb up, down or across natural rock formations or artificial rock walls. The goal is to reach the summit of a formation or the endpoint of a pre-defined route without falling...

, mountaineering
Mountaineering
Mountaineering or mountain climbing is the sport, hobby or profession of hiking, skiing, and climbing mountains. While mountaineering began as attempts to reach the highest point of unclimbed mountains it has branched into specialisations that address different aspects of the mountain and consists...

, cross country skiing, and other such activities. Hydration pack
Hydration pack
A hydration pack is a type of hydration system built as a backpack or waist pack containing a reservoir or "bladder" commonly made of rubber or flexible plastic. The reservoir contains a capped mouth for filling with liquid and a hose that allows the wearer to drink hands-free...

s are small backpacks containing a bladder-like plastic sac to hold up to three litres of water or any other beverage for hands-free drinking; they are sometimes known as camelbacks, from the CamelBak
CamelBak
CamelBak Products, LLC is an outdoors equipment company known primarily for its hydration products, such as hydration packs and water bottles. CamelBak is also a supplier of hydration packs, protective gear, and other products to the U.S. military and law enforcement agencies around the world.The...

 company, the best-known manufacturer of the packs. Packs used in competitive strategic sports such as paintball
Paintball
Paintball is a sport in which players compete, in teams or individually, to eliminate opponents by tagging them with capsules containing water soluble dye and gelatin shell outside propelled from a device called a paintball marker . Paintballs have a non-toxic, biodegradable, water soluble...

 and airsoft
Airsoft
Airsoft is a sport in which participants shoot round non-metallic pellets launched via replica firearms.Gameplay varies in style and composition but often range from short-term skirmishes, organized scenarios, military simulations, historical reenactments, to competition target shooting events...

 are often based on or actually are military gear.
Comparison of backpack designs
Frameless Internal frame External frame
Non-rigid bag strapped to shoulders Semi-rigid frame in the inside of the pack Large rigid (metal, plastic, or wood) frame to which the pack is secured
Light, inexpensive, widely available Tight fit, less bouncing Heavier, good ventilation
Only suitable for light loads (less than about 5 kg) Roomy internal storage, with occasional lash points for external items Large capacity for bulky strap-on items

See also

  • Bindle
    Bindle
    Bindle is a term used to describe the bag, sack, or carrying device stereotypically used by the commonly American sub-culture of hobos. The person carrying a bindle was called a bindlestiff, combining bindle with the Average Joe sense of stiff....

  • Ditty bag
  • Duffel bag
    Duffel bag
    A duffel bag is a large cylindrical bag made of cloth with a drawstring closure at the top....

  • Fanny pack
    Fanny pack
    A fanny pack , belt pack , belly bag , Buffalo pouch , hip sack , waist bag , hip pack , bum bag , cangurera , banano or moon bag is a small fabric pouch secured with a zipper and worn by use of a strap around the hips or...

  • Hydration pack
    Hydration pack
    A hydration pack is a type of hydration system built as a backpack or waist pack containing a reservoir or "bladder" commonly made of rubber or flexible plastic. The reservoir contains a capped mouth for filling with liquid and a hose that allows the wearer to drink hands-free...

  • Messenger bag
  • Papoose
    Papoose
    A papoose is an American English loanword whose present meaning is "a Native American Indian child" or, even more generally, any child, usually used as a term of endearment, often in the context of the child's mother. The word came originally from the Narragansett tribe...

  • Satchel (bag)
    Satchel (bag)
    A satchel is a bag, often with a strap. The strap is often worn so that it diagonally crosses the body, with the bag hanging on the opposite hip, rather than hanging directly down from the shoulder. They are tradionally used for carrying books....

  • Shoulder strap
    Shoulder strap
    A shoulder strap is a strap over a shoulder. They are often affixed to women's dresses to support its weight or as part of its style. The term is also applied to carrying bags and to epaulettes.-Carrier shoulder strap:...

    s
  • Sling bag
    Sling bag
    A sling bag is a type of handbag that is worn over one shoulder with a strap that winds around the chest resting the bag on the lower back. Although it is similar to a messenger bag, a sling bag is often smaller....