It seems like 120 film just as much as 35mm film should have canisters to protect it. I'm just not comfortable licking the tag end on medium format film, and dropping the bare roll in my pocket or camera bag. It seems like they need a canister to keep out bright light, dust, and so on. What if you drop one in the mud or the adhesive strip comes loose and your film insta-unwinds? I never understood why medium format doesn't come in canisters. What do you think?