Just picked up this USGI MSS Goretex Bivy bag; and got to thinking, while it IS heavy, it's basically waterproof/windproof...what if I were to dissect it and use the material to make a sort of Garlington Taco insulator, with open cell foam sectioned from a $10 wal mart open cell mattress topper (around 2" tall...)..... would that be a quick and effective lightweight way to get insulation with less weight? I am aware the goretex bivy bag as is is like 2 pounds, so cutting it down wouldn't be a problem for me....OR i could just sew loops on the corners and then hang it as is..... and then get lightweight DWR nylon for the shell..... (or cannibalize my 4yards of camo DWR from RRBTW....which WAS gonna be used as an undercover of sorts lol)
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