A lot depends on where you will be and how far between resupply. I worry more where the bears are habituated to poaching off of humans. In those places I have often found that bear lockers are often available. In many places the risk is low even though there may be bears. I generally size up the risk based on whether there have been problems there before. If not I just keep the foor and other scented stuff away from my sleeping area. If there have been problems I take whatever seems to be prudent precautions.

In general for most road touring i consider bear canisters to be overkill, but If I were to tour where I felt the need I'd probably use my BV450 since it is quite a bit smaller and lighter than a Garcia or other full size bear keg. I tend to buy food for the next meal or two at a time so a small canister is fine.

The Ursack looks interesting but does not meet requirements in many places where there is a rule requiring a canister.

If going off pavement and into the backcountry there may be different requirements both for capacity and for the need for a canister at all.

I have never felt the need to use either of my canisters when on tour despite having toured a good bit in bear country. That isn't to say that there aren't places where I might consider it. Where do you expect to tour?