so i purchased a bivy sac last year for about 250 dollars, i honestly can't say i am to impressed with it, first off i noticed condensation build up in it even at -40 below, same as during summer does not allow any air movement lost about 5 lbs the other night when i climbed into it, and thats the other problem it is too tight to get into, now i am sure that helps kepp it water proof and i am a big fella at 6ft 4 and 230 lbs, i need to come up with a different system thought it would be great for just sleeping on the trail or during bug season.
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