Our new Odor-Proof barrier bag, OPSAK, has all of the features of the aLOKSAK plus a new-generation barrier film that is completely odor-proof. Now you can carry food and toiletries virtually undetected. Great for preventing animal intrusions at the campsite. "When bear canisters are overkill-but you still want to critter-proof your food against racoons, squirrels, and marmots-get LOKSAK's OPSAK bag. These resealable, washable, polyethylene bags are watertight, airtight, and odorproof, so they prevent animals from sniffing out your edibles and toiletries." Kelly Bastone Gear Guide BACKPACKER Magazine. Specifications: Certified waterproof to 60 meters / 200 feet Tested and approved by Scuba Schools International (SSI) Safe. Our medical grade film is FDA approved Temperature rated -40F to 170FEcologically smart. Highly reusable and 100% made of recyclable Polyethylene. Typical items stored in our OPSAK: Camping and food supplies Anaerobic incubator chambers (specimens grow five times faster than in expensive anaerobic chambers) Pack out body waste Long term bio-hazard storage Soiled diapers Tobacco products Rehydrate or cook dry foods with boiling water Item # Dimensions # of Bags OP3-7x7 7" X 7.75" 3 OP3-9X10 9.15" X 10.75" 3 OP3-12X20 12.25" X 20.75" 3 OP2-28X20 28" X 21" 2