WOFT,<br><br>Check out www.rei.com. They have a large selection of bivy sacks, in a wide range of prices.<br><br>Check out their comparison charts of all the lightweight shelters they sell.<br><br>I have the Outdoor Research Basic with GoreTex top and coated nylon bottom and an older REI model that is all coated nylon.<br><br>I would not buy the coated nylon model again, it is essentially a mummy shaped trash bag...OK but moist.<br><br>Neither one of these has a loop tent pole arrangement to keep the sack off your face. I have only used them as bivy shelters. I prefer a tent a tarp or nothing to sleeping in. I have not found these to be a great primary shelter, but an excellent emergency shelter for climbing or a "waterproof" cover for use in a snow cave.<br><br>Also check out light weight single person tents, (ie MSR Zoid 1), 1.5-2 kg and about the same price as some of the bivy sacks.<br>