I was in Canadian Glacier National Park about 40 years ago. I was riding with 5 other guys and we had camped for the night. We didn't cook or eat anything as we got there late and had already eaten dinner. The bears came in some time in the wee hours and made the most incredible mess. They tipped over every one of the bikes, tore open the packs left on the bikes, scattered everything they could get their hands (paws) on all over the place.
Among the more amazing things they did:
One bear pulled so hard on a bungee cord (a good, sturdy one) so hard that it straightened out the wound metal of the hook where is attaches to the bungee.
One bit through my pack and bit clean through, in two places, a fuel bottle I had that was filled with white gas (I still have that bottle somewhere).
Somehow they manage to find every single piece of rain gear and tear it to pieces (of course it rained for the next five days).
But the most amazing thing was that everyone of us slept right through the whole thing (and we were -- strangely enough -- stone cold sober when we retired).