Absolutely not. The smallest one I know of is the BearVault 450 and that will not fit in the stretch bucket pocket. It's really just for warm layers (I put my toilet kit in it). You can, however get the BearVault 450 into the main body of the pack. The BearVault 500 doesn't fit very well at all and I'm pretty sure any other bear canister will NOT fit either. This is the main reason I have a 65L pack: bear cans.