A bivouac sack (also known as a bivy, bivvy, or bivi) is an extremely small, lightweight, waterproof shelter, and an alternative to traditional tent systems. It is used by climbers, mountaineers, hikers, ultralight backpackers, soldiers and minimalist campers. The bivouac sack has a larger, similar counterpart, called a bivouac shelter. ==Design==...
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http://en.wikipedia.org/wiki/Bivouac_sack
(Bivy Sack) A lightweight, unfilled, waterproof bag that can cover a sleeping bag.
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http://www.americantrails.org/
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