In case readers here are unaware, bear attacks are very rare in North America [1].
You might be more likely to die in a car accident involving a deer on the way to/from your outing, than to be killed by a bear during your outing.
Most knowledgeable folk believe that the best preventative care for bears is educated avoidance, and educating oneself on how to safely handle an encounter [3].
The takeaway from these statistics is not to say that one should be blissfully carefree. Rather, that one should be respectfully educated and pragmatic. It's their territory that we're traversing through, after all. The onus is on us.
It's good to seek mitigations, but it's not healthy to be so afraid. Education is a good antidote to fear! :)
Bear spray is extremely effective. You can make warning trip lines, I think there's even portable electric fences you can rig up for the super baranoid. I only ever saw a bear take down a tent once out of about three hundred nights. A guy left a bar of soap in his tent. He left and went to his truck when he heard the bear.
I wouldn't call that unreasonable, but it's not physically possible for a tent to even slow a bear down if it wants to get in. In my town, bears have gotten into houses and garages by tearing the front doors off their hinges, and by tearing through a house's siding and sheathing.
The bear that tours our neighborhood opens car doors. If the car is locked he'll damage the handle, but if the car doesn't have food in it he won't damage the interior, so we leave our cars unlocked and make sure they're clean. I don't have a garage, otherwise I'd use that.
A couple years ago he broke into a neighbor's RV and tore the kitchen to pieces. IIRC the RV was totalled.
We have bear-proof Toters. They're really nice, but they're kind of a pain for the trash collectors; the mechanism to open them is fiddly and impossible to use with gloves, and because they latch, the truck's robot arm can't empty them unless the guys dismount the truck and open them first.
You would probably be safe hiding inside one of them. Toter's website has videos of testing they did with a brown bear (possibly a grizzly). He fucks it up pretty good but doesn't manage to open it.
