I took one of the holders with me before the trip to hold my 35mm canisters. Much better than 8 wheels in a camera bag. After I've shot, I put the reel back in the holder upside down so I know it was shot. The lid stays tight and appears to be dust and water resistant, although I didn't take it out in the rain, I did take it out camping in some dusty, dry places and the film was fine.
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