What are you planning to do with it? Tops? bush? My experience with stand alone water proof bivys mirrors gravelbens, they are small, tight and condensate pretty badly. They are really designed for cold dry alpine environments.
I run a borah gear bivy now under either a small flat tarp in the bush or a single person mid shelter on the tops, works sweet. Total shelter weight either way is 500-700 grams so not a big sacrifice either way
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