No, but I read years ago of a lady who stored an apple in her Ursack and ended up with apple sauce after the bears had played with the Ursack! Using the Ursack aluminum liner might prevent that, but makes the Ursack less conformable to the inside of the backpack.
Fresh fruit is pretty heavy, but dried fruit not so much.
The last time (2019) I got a wilderness use permit at the Bishop, CA, White Mtn station, I was told that they were ok to use in Inyo National Forest, but not encouraged... Guess who also makes money renting hard sided containers? The USFS.
The Ursack can be shaped to conform to the inside of a pack, whereas a hard container cannot. I've used my Ursack for long or short trips. For weekenders, with fewer items inside, the Ursack just flattens out, but a hard side container cannot.
The Ursack and hard sided containers can still be carried away and played with by bears. I always tie the Ursack, using the Kevlar cord, to a tree or heavy log. The Ursack also comes with an odor-proof plastic sack that goes inside the Ursack. No problems!
Last edited by Bob West; 07/17/20 09:47 AM.