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[pct-l] bivy



 Hi Mary - a bivy sack is short for bivouac shelter. They are used where 
tents can't be because of space limitations or are unnecessary such as the 
bugless rainless desert. Of course ultralite backpackers use tarps instead, a 
very viable alternative especially in the desert.  Tarp use in cold rainy 
places are subject to debate as most on this list already know. No need to 
rehash here. Also, bivys are used for emergency shelter on climbs or extended 
off trail day hikes where the possibility of being caught by darkness exists 
and you then have to spend an unplanned cold night in the woods