I've never been impressed with using film cans as containers for anything including film. They pop open too easily.

Countycomm has actual screw-top match cases for $1.00 each. I bought a couple and they're very rugged and waterproof (gasketed). I see no point to using film cans. I could even see using one of the match cases to hold a bunch of vaseline/cotton balls. They are well enough sealed to not get vaseline all over the place, I think.