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>like to cowboy camp
>usually pretty dry conditions
>sleeping bag is damn near always damp with condensation when I wake up
now suppose I buy one of them there waterproof breathable bivy sacks (looking at outdoor research helium). what happens?
a) dry sleeping bag, bivy holds in body heat so dew point is somewhere outside the sleeping bag
b) wet sleeping bag, bivy holds in moisture
c) other????