When traveling by automobile I keep all film in an insulated lunch box with a wide-mouth 1L Nalgene bottle filled with ice wrapped in a thin plastic produce bag to keep the condensation for getting on the film boxes. You can put the bottle in the freezer with water to freeze. When the ice melts (about a day) stop at any fast food or gas station that serve fountain drinks and fill up the bottle from the ice machine. For 120 film I have waterproof Otter Cases - one holds 5 rolls the other about 10 - which I use when backpacking/hiking with MF. Evening is the best time for unloading/loading LF holders But if you must change during daylight hours, stop at a shady location where it is much cooler (you'll stop sweating), wash and dry your hands thoroughly, and use a changing tent. The Harrison pup tent is perfect for 4x5 size.
With Heathrow being the sole exception, I've always had my film hand checked but its been a while since I last flown with film.
Thomas
Thomas
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