I have an Ursack. Convenient but not critter-proof. Didn't consider canisters back then, thinking that their shape was a significant drawback. Reconsidering since a canister can probably be secured to the rear rack just as a bag might have been, is probably more convenient than a bag, and doubles up as a seat so this meets the multiple uses criteria . In anticipation of a ride in bear/critter country (abundance of raccoons, skunks and what have you). While I am quite familiar with this kind of environment, it'll be the first time I'll camp where there are no bear boxes and no car to store food during the night.

Interested in reading about experiences. Canisters being a staple of backpacking, I assume that this is a no-brainer, although I am not so sure that it can easily be secured on a rack (by design most are slippery).