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Tie cord in a knot

Tie the cord with a double overhand knot–tight–so that there is no opening at the top of the bag. If food is visible, you have packed too much in. If you can see it, a bear can get it.

Move away from camp

URSACK must be secured to a fixed object that is a safe distance from your camp site. Do not keep URSACK in or near your sleeping bag or tent.  If using more than one Ursack, separate them at least 25 yards. Where there are no trees available, try hiding your Ursack under a pile of rocks. If you are using an OPSak and have been meticulous about keeping food smells off the outside, it is unlikely that a bear can find a well hidden Ursack.

Tie up to a strong branch

So that it can’t be crushed or stolen. Tie URSACK to a tree branch using a figure 8 or another knot that resists clinching, so that it can be untied easily. Alternatively, tie a secure knot and then counterbalance over a high (10′ +) tree branch–not a guarantee, but it will thwart some bears.

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The Knot

Use a double overhand knot–tight–so that there is no opening at the top of the bag. Notice there is no slack in the cord or gaps in the closure.

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The Do's & Don'ts

  • DO Tie the cord with a double overhand knot–tight–so that there is no opening at the top of the bag. If food is visible, you have packed too much in. If you can see it, a bear can get it.
  • DO Tie URSACK up to a strong branch so that it can’t be crushed or stolen. Bears have been known to chew through 5 inch branches to get to food.
  • DO Check trailhead regulations.
  • DO Keep any food item that could leak in a plastic bag inside URSACK. Even though a bear may not be able to penetrate URSACK, he may be able to crush the contents. If URSACK does get crushed, there won’t be a “food reward” that can be licked from the outside.
  • DO Machine wash, no bleach line dry
  • DON’T keep URSACK in or near your sleeping bag or tent.
  • DON’T keep URSACK in camp.  URSACK must be secured to a fixed object that is a safe distance from your camp site.
  • DON’T over stuff or force the O.P.SAK to close
  • DON’T leave them next to each other.  If using more than one Ursack, separate them at least 25 yards.

or just watch our instructional video

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VIDEO: HOW MUCH FOOD FITS IN A S29 ALLWHITE