The old school boyancy compensators and the new Stormy Seas jackets use a CO2 charge on a pull string to inflate.
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When I was a kid we had an old fireplace bellows that we used to inflate balloons.
Inflation of what, with what, to what pressure, how quickly?(Air pump, compressed-CO2 cartridge, grey-powder charge, ...)
Minature Universe generator?
I'm pondering the concept of a handheld economic inflation generator.