Based on observed behavior, a bear will swat at and pounce on the canister, then give up and move on. Bears accustomed to seeing them don't even bother because they've learned there's no reward. It's recommended the canister be left in a depression or at least away from slopes or cliffs, so the bear doesn't send it into the next county.

Depending on your tree situation, a "PCT bear bag" hang might be the way to go. Check YouTube for videos of the technique.

I'd also let Stephen Colbert know we're being invaded by illegal Mexican bears. He'd like to know.