I'm trying to figure out how frogs can breathe inside a quart size storage bag. Herpetologists collect them this way. Three to five frogs can live zipped inside a bag for days.
First thing to test, does the zipper leak? Maybe carbon dioxide gets out and oxygen gets in through the zipper.
Smoke test shows there aren't any holes big enough for smoke in a zipper bag. Must be smaller scale than that then.
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