Sierra Designs Bivy Sack

9:10 p.m. on April 8, 2008 (EDT)
0 reviewer rep
21 forum posts

I just bought a sierra designs bivy sack. I love it and it was almost perfect when i tried it out last weekend. The one problem i had is some condensation. Can anyone recommend what i should do differently. My situation:

Dry weather, 30 degrees, synthetic 0 degree bag, no tarp, no pad, mesh window was open, and the humidity was probably 50-60%

1:49 p.m. on April 9, 2008 (EDT)
4,534 reviewer rep
6,031 forum posts

The condensation is from the liter of water your body sweats off during the night. At an RH of 50-60% and temperature of 30F, you will get a little condensation on the outside of the bag and inside of the bivy shell. The only prevention is more ventilation, which bivies don't really provide (though the eVent ones do breathe better than the Gore ones).

October 14, 2019
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