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It's a novel idea, but it's not going to work in any practical sense. Most of those foams take about 15 minutes to setup, and you'll have to come up with some way to fabricate a mold while you spray it. It will be about an hour before you could safely enter your foam sarcophagus, and if this is to be used in an emergency situation, that's probably not time ...


No, it's not going to be feasible: You'd need a lot of cans. To approximate the volume of a sleeping bag and thermal mat I'd say at least around 5-10 cans. For this weight/volume you can just as well bring a proper sleeping bag/tarp/bivvy. The spray foam is not stable in itself. It will form bubbly clouds of foam, so you'd need a mold. This is not easy, ...

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