Proper food storage is not optional in bear country — it protects you, it protects the bears, and in many areas it is the law. A fed bear becomes a dangerous bear, and rangers can fine you or end your trip for improper storage. The two main tools are hard-sided bear canisters and soft-sided Ursacks, and they solve the same problem in very different ways. Understanding how each one works, where each is required, and what their limits are will keep your food safe and your trip legal.

A bear canister is a hard plastic cylinder with a locking lid that a bear cannot open, crush, or bite through. You put all your food, trash, and scented items inside, lock the lid, and place the canister on the ground away from your tent — usually 100 feet from camp and away from cliffs or water where a bear could roll it away. Canisters are required in many national parks, including Yosemite, Rocky Mountain, and parts of the Adirondacks, and rangers check for them at trailheads. The downside is weight and bulk: a standard canister weighs about 2.5 pounds and takes up significant pack space, though newer models like the BearVault BV450 are smaller and lighter for short trips.

An Ursack is a bag made from ultra-strong Spectra fabric that a bear cannot tear open, tied to a tree with a special knot. It weighs about 8 ounces — a fraction of a canister — and packs flat when empty, which is why ultralight hikers love it. However, an Ursack does not stop a bear from crushing your food inside the bag, so your meals may end up as crumbs, and it is not approved everywhere canisters are required. Some models include an aluminium liner that reduces crushing, and pairing the Ursack with an odour-proof bag inside helps keep smells down. Always check the specific rules for your destination before choosing an Ursack, because approval varies by park and forest.

Land managers set the rules, and they differ widely. Yosemite, Sequoia-Kings Canyon, and Rocky Mountain National Park require hard-sided canisters — Ursacks are not accepted. Many national forests and wilderness areas accept Ursacks, and some areas allow hanging food from a tree using the PCT method. A few places have bear boxes at campsites, which remove the need to carry any container at all. The rules change, so check the park or forest website and call the ranger station before your trip rather than relying on an old blog post. Carrying the wrong container can mean a fine, a forced exit, or a very hungry bear visiting your camp.

Whichever container you use, packing matters. Put everything scented inside — not just food, but toothpaste, sunscreen, lip balm, and trash. Repack food into zip bags at home to reduce volume and smell, and keep the container sealed except when you are actively cooking or eating. Cook and eat at least 100 feet from where you sleep, and never eat in your tent. Store the canister or Ursack away from camp overnight, on flat ground where a bear cannot roll it off a cliff or into a river. In the morning, check the container before opening it — if a bear visited overnight, you will see the signs.

Bears are not the only concern. Marmots, mice, and raccoons will chew through a tent or pack to reach food, and mini-bears — mice and chipmunks — ruin more trips than grizzlies do. An Ursack or canister protects against them too, and hanging food properly keeps rodents away from your pack at night. In desert areas, ravens and rodents are the main threat, and a sealed container still helps. The core habit is the same everywhere: never leave food unattended, never store food in your tent, and always carry out every scrap of trash. Good food storage is a skill every backpacker should practise until it is automatic.