I have often wondered how much those Ur sacks are useful against a bear. A friend had one on a mountaneering trip, and his crampons "got out" and destroyed the Ur Sack... Bears teeth have to be worse than crampons... right?
Another thought I can't get out of my head is the food will be completely crushed and not very edible once a bear is done with a sac....
Am I wrong? Missing something? Any real world testimonials out there?
