I use bear bags I bought from amazon. they are really heavy duty and I wash them after I use them, as I can't find them again. To test these, I added a pack of opened meat outside overnight (have a massive coon that hangs around), it he/she didn't touch it, but tried to make off with my ex-husband's lunch box which was found have way down the driveway before it was given up on. there are other options rather than JUST canisters. just do an internet search.