Milk crate
Encyclopedia
Milk crates are square
Square (geometry)
In geometry, a square is a regular quadrilateral. This means that it has four equal sides and four equal angles...

 or rectangular interlocking box
Box
Box describes a variety of containers and receptacles for permanent use as storage, or for temporary use often for transporting contents. The word derives from the Greek πύξος , "box, boxwood"....

es that are used to transport milk
Milk
Milk is a white liquid produced by the mammary glands of mammals. It is the primary source of nutrition for young mammals before they are able to digest other types of food. Early-lactation milk contains colostrum, which carries the mother's antibodies to the baby and can reduce the risk of many...

 and other products from dairies
Dairy
A dairy is a business enterprise established for the harvesting of animal milk—mostly from cows or goats, but also from buffalo, sheep, horses or camels —for human consumption. A dairy is typically located on a dedicated dairy farm or section of a multi-purpose farm that is concerned...

 to retail
Retail
Retail consists of the sale of physical goods or merchandise from a fixed location, such as a department store, boutique or kiosk, or by mail, in small or individual lots for direct consumption by the purchaser. Retailing may include subordinated services, such as delivery. Purchasers may be...

 establishments. Middle 20th century ones were made of wood, later ones were stainless steel, and those made in the latter part of the century were of heavy-duty polyethylene
Polyethylene
Polyethylene or polythene is the most widely used plastic, with an annual production of approximately 80 million metric tons...

. In Europe the term "bottle crate
Bottle crate
A bottle crate or beverage crate is a container used for transport of beverage containers. In the present day they are usually made of plastic, but before the widespread use of plastic they tended to be made of wood or metal....

" is more common but in the United States the term "milk crate" is applied even when the transported beverage is not milk.

Milk crates are often stolen for either personal or business use or for the plastic that they are made out of. Theft of milk crates can cost dairies millions of US dollars per year. This has led at least one dairy farm to hire a private investigator to discover what is happening to the crates; the results of investigations point to plastic re-sellers being the culprits in the majority of thefts.

In July 2008, Wal-Mart
Wal-Mart
Wal-Mart Stores, Inc. , branded as Walmart since 2008 and Wal-Mart before then, is an American public multinational corporation that runs chains of large discount department stores and warehouse stores. The company is the world's 18th largest public corporation, according to the Forbes Global 2000...

 and some other stores introduced a square milk jug
Square milk jug
The square milk jug is a variant of the plastic gallon container of milk commonly sold in the United States and Canada. The design was introduced in the summer of 2008 and is marketed as environmentally friendly because of the shape's advantages for shipping and storage . Square milk jugs are...

 that does not need to be transported in a crate. Sometimes called "green" milk jugs, they are not green
Green
Green is a color, the perception of which is evoked by light having a spectrum dominated by energy with a wavelength of roughly 520–570 nanometres. In the subtractive color system, it is not a primary color, but is created out of a mixture of yellow and blue, or yellow and cyan; it is considered...

 in color, but rather are claimed to be environmentally friendly
Environmentalism
Environmentalism is a broad philosophy, ideology and social movement regarding concerns for environmental conservation and improvement of the health of the environment, particularly as the measure for this health seeks to incorporate the concerns of non-human elements...

. These new milk jugs are stackable, and can be transported without crates. Companies need not buy plastic for the crates, nor transport or wash them.
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