Designed for hazardous materials and biological waste, these bags have been proven in bear country to be odor proof,,,making them great for preventing animal instrusions at the campsite. They are also waterproof, humidity proof and dust proof. It's fine to pour boiling water into the bag to cook or rehydrate foods. Use as freezer bags to prevent freezer burn. The manufacturer reccommends using a Clip-N-Seal if you are planning to stuff the OPSAKs into backpacks or duffel bags. This will give you the extra security to abuse the bags.
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