Answer Question
Our favorite all-season Bivy Sack is the Outdoor Research Alpine Bivy. It is weather proof, has enough room to stay comfortable, and will keep you warm in when you need it. For a lighter weight 3-season option we recommend the Outdoor Research Helium Bivy. Both the Helium and Alpine Bivy have good head room, so you won't feel claustrophobic while inside, which can be surprisingly important especially when trying to get to sleep.
Difference between upwind vs. downwind?
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