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For really long term, freezing is best, but that does not protect from gamma radiation, which can fog after enough time not matter the temperature. A lead lined bag would be good for that. For normal use, I just keep everything in a fridge in my studio along with snacks and drinks. A year ago, I shot a roll of Kodachrome 25 that had been sitting in that fridge since the late 80's. It expired in '91, and aside from losing a bit of film speed, everything looked fantastic, actually unbelievably so. As long at my film has been kept cold for most of the time I've had it, it doesn't seem to matter even if it's a few years out of date. The twenty years for the PKM was extreme, but then, I only had a couple rolls left and had nothing to lose but a couple of processing charges.