as i said in previous comment, the paper is pretty light tight, but to keep light from piping down the edges at the flanges -- it can over time -- wrap the film in aluminum foil or just put it in a black bag of some sort. No need to rush, i just keep mine out of direct sunlight and shove it in my pocket until i get back to the car.
Originally Posted by powasky
if you saw the bottom end off of a 35mm film can (black one) and then tape that tube to the top of a second black can, you have an instant 120 film storage holderwith lid. Some brands of film also come in tubes, and i believe there is a brand of mini-M&Ms that come in a tube that works nicely.