Watchful Eye Designs O.P. Sak 9"x6" Flat (12-Pack)

View our entire selection of Aloksak and O.P. Sak Zip-Closure Water- and Odor-Proof Storage Bags.

Looking for a more durable zip storage bag for backpacking gear? Try the Aloksaks.

O.P. Sak 9" x 6"

• Usable Dimensions: 8.75" x 5.25"
• Weight: 0.258 ounces each (compare to a Hefty quart sized freezer bag at 0.275 ounces)
• Zip Closure: Across the 9" dimension

O.P. Sak Features

The O.P. Sak uses an odor-proof material, so it's great for storing food, tobacco, toiletries, or for "blue-bagging" human waste out of sensitive areas. Bags are clear for easy viewing of contents.

Are O.P. Saks Really Odorproof?

Well, yes, quite so. We slathered a bunch of honey, peanut butter, and olive oil in one and left it out for four days in the corner of a forest service cabin while we were out tramping around on a hike. We knew the cabin to be infested with both mice and pack rats, and when we came back, the O.P. Sak was intact with no sign whatsoever of animal intrusion, despite the fact that there were fresh droppings and sawdust scattered throughout the cabin.

Ursack liners are actually O.P. Saks. And, we've been using O.P. Saks for food storage while backpacking in both grizzly and black bear country in Glacier NP, Yellowstone NP, the Bob Marshall Wilderness, Tetons, Wind Rivers, and Uintas. Below the treeline, we simply add a mesh sack with a drawcord and hang our food with AirCore Plus. Above the treeline, we store the O.P. Sak under a pile of rocks, or sometimes, just sleep with it next to our shelter. Even in the most rodent-and-bear-infested areas, we've not had a single curious critter attempt to get into the O.P. Sak.