Why are bear canisters required in some parks and not others?

Everything You Need to Know About Bear Containers

Storing Food - Bears (U.S. National Park Service)

Paul Logan

Bear canisters are now required in Lassen Volcanic National Park - Pacific Crest Trail Association

Bear-resistant food storage container - Wikipedia

How to Hang a Bear Bag — Washington Trails Association

Here's the Bear Protection You Need in the National Parks - Backpacker

A Brief History of Bear-Proofing In Yosemite, From a Garbage Dump to Canisters

Bears at Yosemite and Sequoia: How to Be Safe

Bear Canisters: Everything You Need To Know

One of the first signs you will see at the bear park in any zoo is 'Don't feed the bears'. This is so true in a bear's natural habitat too. There is

UDAP BRCWC: No-Fed-Bear with Case (Bear Proof Food Canister)