you have no idea what you're talking about, and you're no scientist. take something containing warm, moist air from inside a house and put it outside in subfreezing weather and you will absolutely get condensation on the inside of the outer layer. camera bag, lens, film bag, whatever. any time air comes in contact with something cold enough to drop it below the dew point, you get condensation. doesn't matter if it's air surrounding a cold object (eg film) or air contained in an object (eg film bag) that's being cooled by the surrounding cold air.
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