Bear canisters don't do much to stop bears from coming around (you smell like food) they stop bears from getting at your calories and becoming habituated. (I have not conducted extensive scholarly research to support this, just hiked around in bear country.) I bought a canister in Lone Pine for the Sierras (where I also mistakenly believed crampons and poles were required - they're not as it turns out: my B!) and I hated it so much I gifted it to another hiker and borrowed and ErSack for as long as I thought I could get away with it - then ditched it too. (Turns out rangers don't really care, or have any authority anyway I'm told.) I thought the sacks we're approved now, but am not sure - I do know they are way better than that stupid can which makes a great seat, and a drum too by the way. Where else are you going to put your "I'm a hiker" stickers when your Nalgene is covered with dogma? Don't worry - I'm sure the facts are forthcoming! Only 70 days of meteorological winter left!