Originally Posted by Funny Money
I recall seeing a guy use a "blizzard bag" I think it's called, as a pod.
It has one major advantage over blankets: baffles with reflective layers on top & bottom. The baffles are elastic so they hug the user, and the air space serves as insulation.
With your idea, I believe getting and maintaining a uniform airspace will be VERY difficult, and without it you will have outside moving air currents rob you of heat.
Good thinking, don't give up on creativity, report back on how it goes, and don't give up on a good underquilt!
You just sparked an idea in my head with the baffle talk. With a tarp, mylar and a hot glue gun / some sort of adhesive (I don't sew, lol), one could easily their own system with baffles like that. (It's probably been done already, but sounds like it would be fun to try.