Waterproof canisters for 120 film.

[BAC1967]

I have a Hama Film-Safe X that's splash resistant, it holds 4 rolls of 135 or two rolls of 120 plus it protects against X-rays.

https://www.bhphotovideo.com/c/prod...MIseGy0cab4wIVVRx9Ch1I3gXjEAQYASABEgJkMfD_BwE

http://www.centuryphoto.com/hama-film-safe-x-containers/camera-accessories/