SEAL IT IN.
KEEP THEM OUT.

OPSAK bags seal odors completely. The patented multi-layer barrier film does not let scent molecules escape. Bears, dogs, and wildlife cannot detect what is inside.

Bear Barrier Tested  ·  Military Grade  ·  FDA Approved  ·  Made in USA

Not sure which size? See the Size Guide
OPSAK odor-proof bags in use
OPSAK

vs. The Competition

Most odor-resistant bags slow scent down. OPSAK stops it.

The difference is the seal. OPSAK uses the same airtight, watertight double-lock closure as aLOKSAK, a bag trusted by the US military and certified for diving to 200 feet. That seal, combined with a purpose-built odor barrier film, means scent molecules cannot escape. Not some. Not most. None.

Made from FDA approved food grade materials and Bear Barrier Tested, the standard wildlife managers use to verify a bag can fool an animal's nose.

Trusted by hunters, backcountry guides, and rangers who cannot afford to get it wrong. Made in USA since 1996. BPA-Free.

What Customers Are Saying

Verified Amazon Purchases

★★★★★

“These odor proof bags worked excellently to keep odor to a minimum when in bear country near Cody, Wyoming hunting. We never had any encounters with bears. The bags seal well and had a good capacity for storing food for 5 days. They are easy to use and added very little weight to my hunting pack. I should be able to reuse them for several trips into the backcountry. I highly recommend these for backpacking.”

Janelle  ·  Verified Amazon Purchase

★★★★★

“As a test, I bought some guava and put it in one of these bags. If you've been near ripe guava, you'll know it has an extremely strong and noticeable scent. This bag blocked it entirely. My dog could not smell it after placing the bag on the floor. This will work well for camping. I have zero doubts.”

Cody  ·  Verified Amazon Purchase

★★★★★

“I used these inside the Ursack for a 4-day backpacking trip in the Grand Canyon. I have a Search and Rescue GSD with full access to the room. She never even sniffed it. In the Grand Canyon a squirrel tried to steal my Garmin off my belt. No squirrels came near the Ursack. We had footprints of little night critters in camp but none around my food.”

Laura C.  ·  Verified Amazon Purchase

Care & Use

Keep the Odor-Proof Seal Airtight

Cleaning

Hand wash with warm water and a mild dish soap, rinse thoroughly, and air dry completely before the next use.

Odor-Proof Seal

A clean zipper is essential for an airtight seal. Inspect the tracks for dirt, oils, or food residue before sealing, and close the zipper firmly from one end to the other to confirm both tracks are fully engaged.

Storage

Store clean and dry, protected from sharp objects or excessive abrasion. Replace the bag if the film or zipper becomes damaged.

Know When to Replace

Cared for properly, OPSAK® bags hold up to trip after trip of regular use. But no bag lasts forever, and how long any individual bag holds up depends entirely on how often and how hard it's used. Inspect the seal before every use and replace the bag at the first sign of wear to the seal, film, or zipper.