tape
Some tapes can be nasty stuff, as far as leaving a mess or harming the camera, and if I were to use tape, which I don't, I would use the blue painter's tape, which comes off easy and without leaving a mess. It can be tricky to clean the gooey stuff off that some tape tends to leave, especially if it has dried up.
My system avoids messes and mistakes, and it's hard to screw this up, knock on wood, although I'll probably find a way.
I have settled on writing the name of the camera on the package the film came out of, and keeping that for reference, with my camera stuff. Easy to refer to. When I develop the film (or get it back, as I don't do my own color film), I keep the package (opened up and flattened out) with the negatives. That way, I always know what exact film was used with that set of negatives. It's simple and foolproof. I put dates on the package, too, with a sharpie. That shows whether fresh or old film was used, because the film's expiration date is also on the package (usually, depending?) The package can also be kept in a camera bag, especially if there are several bodies in there (camera bodies, that is).
Sometimes the film doesn't have a cardboard box, or even a wrapper, so the convenient holders on some cameras, for example modern ones they've been making since they quit putting fins on cars, are handy but can fall victim to the "no cardboard end-of-box label" problem. Old cameras, since before computers, forget it! My system works on any camera, and with any film. Sometimes all I have is the foil pack, so I write on that, or write on a piece of paper if no packing at all, like when you get a bunch of 35mm rolls in a bag, in their cans.
I'm lucky none of my cameras have scars from (other peoples') old tape on them. Short term, I guess it might be ok.
Masking tape and a sharpie on the back of the cam!
(at least from my perspective).
