A bear bag is any bag used to store food and scented items out of reach of wildlife by hanging it from a tree or by using chew-resistant fabric that bears cannot rip open.
Every backpacker who carries food into bear country needs a plan for keeping it away from animals overnight. Knowing which one fits your trip, your region, and the local rules is the difference between waking up to your food intact or watching a bear drag your supplies into the woods.
What a Traditional Bear Bag Is (And How to Hang One)
A traditional bear bag is a waterproof stuff sack or dry bag that you hoist into a tree to keep it out of reach. It does not stop a bear from tearing the bag—the hang is what protects it.
Typical capacity is 20 liters, with ultralight options down to 14 liters.
- Throw your rope over the branch, tie the bag to the rope with a carabiner, and hoist it so the bag sits about halfway up the branch height.
- Hang the bag upside down so rain cannot enter the closure.
This method works well where black bears are the main concern, but it is less reliable in grizzly territory, where bears are strong enough to climb or knock branches down.
What a Modern Bear-Proof Bag Is (Ursack and How It Works)
| Model | Capacity | Weight | Best For |
|---|---|---|---|
| Ursack Major | ~10.65 liters | 7.6 oz | About 5 days of food |
| Ursack AllMitey | ~10.65 liters | ~7.6 oz | Ratios added rodent resistance |
| Ursack Small | ~5 liters | ~4–5 oz | 2–3 days of food |
Using an Ursack is different from hanging a bag. The tie must be tight so a bear cannot drag the whole bag away. IGBC certification means many parks that once required heavy hard-sided canisters now accept Ursacks — but always check local regulations before you go.
If you are ready to buy, our tested bear bag recommendations for backpacking cover the top options for each trip type.
Traditional Hang vs. Bear-Proof Bag: When Each Works
The right choice depends on where you are hiking and what kind of wildlife lives there.
- Black bear habitat (Appalachian Trail, Shenandoah): A well-executed PCT hang works, but it takes practice and the right gear. An Ursack is simpler and more reliable, especially in high-use areas.
- Grizzly territory: Hanging food is less effective and less safe. Hard-sided canisters are still strongly recommended, though Ursacks are approved in some grizzly zones. If bears in the area have learned to destroy soft bags, go with a canister.
- Rodent problems: The Ursack AllMitey model adds rodent resistance, which matters in shelters and on popular long-distance trails where mice are relentless.
Common mistakes include hanging the bag too low (under 10 feet), too close to the trunk, or using a non-waterproof stuff sack. A bear that can reach a bag will get it.
FAQs
Can I just use a regular dry bag as a bear bag?
A regular dry bag works for a traditional hang but offers zero protection if a bear reaches it. You must hang it high enough to keep animals away, and the bag itself must be waterproof to survive rain.
Is an Ursack the same as a bear bag?
An Ursack is a specific brand and type of bear-proof bag. All Ursacks are bear bags, but not all bear bags are Ursacks — many are simple stuff sacks that rely entirely on the hang for protection.
Do I need a hard-sided canister instead of a bear bag?
You need a hard-sided canister in grizzly territory where bears regularly get into food, or in any park or preserve that specifically requires them. Ursacks are approved in many areas that once required canisters, but verify the rules for your destination.
References & Sources
- Ursack. Ursack Bear-Proof Bags. Official product information and IGBC certification details.
- Ursack. Ursack Major Product Page. Specifications for the Major, AllMitey, and Small models.
- REI. Bear-Resistant Canisters: How to Choose. Expert advice on hang methods and hard canister recommendations.