OPSaks are a sealable plastic bag made from a special film that is 17,000 times more odor resistant than HDPE. When used properly, the OPSak (with new double zip closure) is 100% water and air tight. Use with Ursacks to keep bears and other critters from smelling your food. Bags meet FDA and USDA specifications for food contact and can even hold boiling water or be used as food freezer bags.
The bags are considered disposable and will need to be replaced after extended use. The closure is a lighter weight material in order to insure pliability to create 100% contact throughout the closure.
Dimensions: 12.25" x 20.75" inches
Weight (each): 0.8 ounce
Learn more - Read Andrew Skurka's long term review of the OPSak.
Note: The manufacturer of OPSak has to see any bag that a customer claims was defective at the time of purchase. They will only consider reviewing a bag within 30 days of purchase and the bag must be accompanied with a paid invoice/ receipt.