"I had a pack of coyotes take turns on my hanging standard Ursack. There were many teeth impressions, but none penetrated and no food damaged."
Last summer I had a black bear give a go at my standard ursack, but it was not hanging, there were no trees. I also had many tooth impressions, with only a few actually puncturing the ursack. We were sleeping in a campground, so we had no choice but to tie our ursacks together and hope for the best. I woke up to a bear beside my head thrashing the ursack around. For the amount of time and energy the bear spent trying to get into it I'm pretty impressed that there were only a few tiny holes.