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A waterskin is a receptacle used to hold water. Normally made of a sheep or cow bladder, it retains water naturally and therefore was very useful in desert crossings up until the invention of the canteen. It is still used in some developing nations. Though it may have been used over 5000 years ago by tribal peoples, the first pictures of it are from ancient Assyrians, who used the bladders as floats in 3000 B.C. It also was used by large ancient empires such as Rome before the advent of the canteen.
Modern waterskins are often made of various plastic or rubber impregnated canvases, or sometimes simply thicker transparent plastics, and are often called water-pouches, water bags, or water bladders, since they are often not involving any sort of skin or leather products. Such modern waterskins offer many features, such as detachable straw-hoses, valves, refill openings of various widths, various closures and handles, styles of covering and/or cases, and removable cases/carry pouches.
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