For anyone who's confused about the size of the tubes, here's the skinny:
M&M Minis are sold in two different sizes. A regular size, and a large (sometimes referred to as 'King Size'). The regular tubes hold one roll of 120/220 with perhaps a bit less than an inch of space at the top. The large (or King Size) tubes hold 2 rolls, with a little less space at the top.
I've been using these to store my exposed rolls of film in for a couple years. I heard about someone else doing it (either here or on another film forum). I highly recommend it.
Plus, I love candy and it's a great excuse to both eat candy, and shoot film.