User Review: BearVault BV500
I used this bear canister in late August in Rocky Mountain National Park, CO. It was a rental as I typically prefer bear bags over canisters, but bags were not permitted in said park (apparently mother bears have taken to sending their cubs up trees after bags).
This canister was light enough and with some clever arrangement in my pack, I had no problems with its bulk, either. I can't comment on this canister's resilience to bear attacks as I did not encounter one while on the trip, but it was hard enough for ME to open up. I can only imagine that a bear would find it impossible without thumbs.
Bottom line: This is a pretty solid canister; I gave it 4 stars simply because I greatly prefer to use bags, so take this review with a grain of salt.