We didn't take one. None of the parks that I know of require one unless going into the back country to camp (not allowed by bike). In places where bears are a big problem the campgrounds all had bear boxes. There was one place where they say food had to be put in your vehicle, but we asked someone in a neighboring site to put our food in their car. A few other place we hung our food.
I didn't/wouldn't take one but if you do the BV450 is fairly small and light and IMO more suitable for bike touring than a bigger one. It is at the best intersection size and price for touring, IMO.
As far as the URsack getting carried off... They recommend tying it off to something so that shouldn't be a problem. Bears will play soccer with canisters and knock them around pretty far sometimes, so the canister may be more likely to get lost.
Approval probably isn't an issue for bike touring unless it is combined with overnight hiking, so you might possibly want to reconsider the URsack if you decide to carry something.