I used the 12x20 inch bag in combination with a large Adotec bag on the Colorado Trail. I had 5-6 days of repackaged food stored in it, and after two days the seal ripped and wouldn't stay closed. That being said, between the Opsak and Adotec bag no critters or bears bothered my food tied to a tree.

These are amazing bags that keep odor away!!

These bags are essential for making Ursacks odor free and safer. We buy a new set each year as necessary equipment for travel in bear country.

Spent 4 nights in the Wimenuche Wilderness backpacking and it worked great!

I love this product. Everything from Leave No Trace to food storage and prep. Use even as a hot water bottle for sore muscles after a day on the trail.