Bob… "So, canisters seem to be much more foolproof than hanging, plastic bags, or the other methods."
emphasis on the word 'fool'…
Canisters are much easier for any fool to operate correctly…
Most of the time that people lost their food before the canister era, it was operator error… not hanging right, wrong branch choice, not hanging food right away when you get to camp… etc etc.. groups like the boy scouts were a cornucopia of food for the bears…
Yes, that's my view.. it used to be quite common for a bear in camp… many times had them brushing up against my tent as I try to sleep… rummaging around my pots and pans… or up a tree trying to get at my hang… got to where I just expected them as part of the deal… in Little Yosemite they would follow you down the trail and wait for you to take your pack off and walk away from it looking for where to pitch your tent… love that sound of claws ripping through pack cloth :)
Now that canisters are the norm I never see bears in camp… Inyo Ranger told me a few weeks ago they almost never get a bear incident report any more…
I think it's clear the canisters are doing their job.
Bill D.