Bob Shroy wrote a review of Bear Vault BV500 Bear Resistant Food Canister on August 27, 2010
Why would you want a bear canister that a bear can open ?
There are well documented cases of these canisters being opened by a bear in the Adirondacks near Marcy Dam. The manufacturer discussed this at :
Especially bad is that this problem was identified in the 2007 hiking season and has not been fixed, nor retrofits made available to existing customers, so far (near the end of the 2010 season).