There are a number of bear canisters on the market. Be aware that the list of “approved” canisters changes. For the latest information on bear canisters approved by the National Park Service</a.
For tips on how to pack your canister, read The Care and Feeding of Your Bear Canister by Tom Reynolds.
Pacific Crest Trail Association – Bears
Cramming 18 pounds of food into a canister may, at first, seem impossible. However, following these instructions and a little planning and patience will accomplish the task.
source – Tom Reynolds
I am most interested in the “Ursackâ€, myself. (I could have used one in Australia to keep out pesky possums.)
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