I was looking at the Sea to Summit eVent compression dry sacks at REI yesterday. On my upcoming rafting trip on the Middle Fork Salmon River, I will be provided two heavy duty dry bags to store my gear. One will be for getting into during the day and one for shelter and bedding but not accessible during the day. My past experience in the Grand Canyon has shown that there is always the possibility of some leakage and dampness always seems to permeate everything inside. I was thinking about placing my down insulation in one of these eVent dry sacks, inside the heavy duty dry sack. I know they are supposed to be waterproof, but I wonder if they are vapor proof?
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