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Rock climber Chuck Pratt bivouacking during the first ascent of the Salathé Wall on El Capitan in Yosemite Valley in September 1961.. A bivouac shelter or bivvy (alternately bivy, bivi, bivvi) is any of a variety of improvised camp site or shelter that is usually of a temporary nature, used especially by soldiers or people engaged in backpacking, bikepacking, scouting or mountain climbing. [1]
One subcategory of cold-weather sleeping bags, the mummy bag, is so named because it has an insulated hood for the head. A bivouac sack (bivy) is a waterproof cover for a sleeping bag that may be used in place of a tent by minimalist, experienced hikers. A bivy bag may also be carried by day hikers as a backup or emergency shelter, to be used ...
The cowboy bedroll was an American Old West precursor to the modern sleeping bag, which carried a man's bed and some personal belongings in a waterproof shell. In Australia, it is called a swag . A "swagman" from Australia carrying a variation of the cowboy bedroll, called a " swag ", ca. 1901
Sleeping bag liner. Sleeping bag liners are lightweight cloth sacks usually fitted inside sleeping bags to provide extra comfort, insulation, and help keep the sleeping bag clean. [1] [2] A thin liner may feel softer against the sleeper's skin, add 5 °F warmth to the bag (not pad), and be easily washed after use (unlike the thicker sleeping bag).
Generation III Extended Cold Weather Clothing System ECWCS levels 7 (left) and 5 (right). The Extended Cold Weather Clothing System (ECWCS / ˈ É› k w æ k s /) is a protective clothing system developed in the 1980s by the United States Army Natick Soldier Research, Development and Engineering Center, Natick, Massachusetts.
In 1938 Roy J. Plunket, a recent hire at DuPont, discovered polytetrafluoroethylene (or Teflon)—a fluoropolymer that led to the invention of synthetic rubbers. [2] His early discovery led 3M scientists to develop the formula for Scotchgard, discovered by accident in 1953 when Joan Mullan—a 3M lab technician—spilled a few drops of a fluorochemical liquid destined for rubber jet fuel hoses ...
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