Ursack Major Bear-Proof Bag

Ursack Major Bear-Proof Bag

A certified bear-resistant food bag that replaces the hard canister without replacing the peace of mind. The Ursack Major is one of the most popular alternatives to a traditional bear canister because it actually solves the weight and packability problem that canisters never could.

Why We Carry It
For backpackers heading into the Colorado wilderness where bear canisters are required or strongly recommended, this is the option that doesn't make you reorganize your entire pack to fit a plastic cylinder.

Highlights

• UHMWP fabric construction — Ultra-high-molecular-weight polyethylene is one of the strongest fabrics available. Bears can mouth and claw at it without getting through. A material choice backed by independent bear-resistance certification.
• Certified bear resistant — Not just bear-resistant in theory. Certified through independent testing to meet the standards required in bear canister mandatory zones. Check current regulations for your specific area before your trip.
• 7.6 ounce total weight — A fraction of the weight of a hard-sided canister. The weight argument for a traditional canister disappears entirely at this number.
• 10.65 liter capacity — Holds approximately five days of food for one person or up to 37 single-serving freeze-dried meals. Enough capacity for a standard backcountry trip without overpacking.
• Collapsible and packable — Rolls or folds down when not full so it adapts to your actual food load rather than taking up fixed space like a hard canister.
• 6-foot high-tensile reflective cord — Tie it off to a tree at camp and find it in the dark. The reflective tracer and exterior tag make locating the bag at night straightforward.
• Compatible with OP Sak odor barrier bags — Ursack recommends using an OP Sak 12x20 odor barrier inside the Major for additional protection against scent detection. Sold separately.

Best for

Backpackers who need certified bear-resistant food storage and want a lightweight, packable alternative to a hard-sided canister. A strong choice for multi-day trips in Colorado wilderness areas, national parks, and anywhere bears are active and food storage requirements apply.

Compatibility Note

Certified bear resistant for use where bear canisters are required or recommended. Always verify current regulations for your specific wilderness area before your trip as acceptance varies by jurisdiction. Odor barrier bag sold separately and recommended for additional protection.