I was on a group hike into the Daks and we hung our food bag as we should have. This was before the bear cannister ruling so it is ancient history. We had a fisher climb out on the bag ropes and chew through the bag. One of the leaders saw the critter on the bag and chased it away before too much damage was done. I use an Ursack now but they are not small rodent proof. Some little small critter chews on my ursack I will have rodent stew if I catch the thing.