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Sleeping bag

In camping and other outdoor activities, a sleeping bag is a protective "bag" for sleeping, analogous to a bed. Its primary purpose is to provide warmth and insulation. It also protects, to some extent, against wind, precipitation, and exposure to view, but a tent performs those functions better. The bottom surface also provides some cushioning, but a sleeping pad is usually used for that purpose. A bivouac sack (bivy) is a waterproof cover for a sleeping bag that may be used in place of a tent, if rain or very cold temperatures are not expected.

A basic sleeping bag is simply a square blanket, filled with cotton or other material, and fitted with a zipper on three sides allowing it to be folded in half and secured in this position. A sleeping bag of this type is packed by being folded in thirds, rolled up, and bound with straps or cords. The basic design works well for most camping needs, but is inadequate under more demanding circumstances.

The second major type of sleeping bag, sometimes called a mummy bag due to its shape, is different in a number of important ways.

This type of sleeping bag cannot be rolled; instead, it is simply stuffed into a special drawstring bag called a stuff sack. A compression sack is a special type of stuff sack with a cloth lid that is attached to the opposite (closed) end of the sack with adjustable straps. When the straps are forcibly shortened, the sack is reduced in size, for easier stowage in internal-frame backpacks.