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Wow, those are some great bear encounters. Scary, but amazing to have had that experience.
To answer your questions. The bear canister is not odor proof in any way. It doesn't need to be. The bears know that backpackers have food and will come to your camp looking for it.
Don't hide the can, just put it in plain view in your kitchen area (where you cooked dinner) a bit away from your tent.
When the bear comes around in the evening it will see your tent, look for your food and recognize that bear can in the kitchen area. Being familiar with bear cans and wicked smart to boot, the bear will know that there is no food to be found in your camp and saunter on. Meanwhile you can be snug in your sleeping bag without a worry. Really.
I did three weeks on the JMT this summer. We went through some of the most bear troubled areas of California: the trail to Half Dome, Cathedral lake, Lyle Canyon, Thousand Island Lake, and Rae Lakes. I saw exactly ZERO bears. Not because the bears were not there, I am sure they were, but because they passed through our camps quickly once they found we had all our food in bear cans.
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