Quote:
I've also been thinking about the value of at least a small piece of closed-cell foam to provide insulation while sitting/lying on the ground. Of course that wouldn't fit inside the bottle. In a short-term survival situation, what would be used to keep the group from sucking heat away from you while sitting or laying down?


Get a large tyvek envelope, such as a USPS Priority or Express mail envelope. Crush repeatedly in hands until supple. Roll tightly, fold, and secure with a ranger band or tie. To use, open envelope and stuff with vegetation, cardboard, paper - whatever is at hand. Seal envelope if desired. Sit.

This works extremely well with one caveat: It is slippery compared to a closed cell pad, so sitting on a slope can take a bit of exertion. There are ways to remedy the slipperyness, but this is the lightest and most compact "sit pad" surrogate that I have tried so far.

Tom