I'd like to thank trailgear for the info on the survival tube. I ordered 2 green tubes and used one to make an underquilt today. I'm pleased with the results. My previous underquilt was an old, blue, down sleeping bag that weighed too much (about 4 lbs). The survival tube underquilt weighs just over 1 lb.
Tomorrow I'll use the 2nd tube to make an overquilt.
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