VacMaster 30734 Vacuum Chamber Pouches are puncture resistant and shield food from freezer burn and dehydration. These nylon / polyethylene 3 mil pouches keeps food fresh up to 5x longer and can be frozen, refrigerated, microwaved, boiled or cooked sous vide. Will not work with suction type vacuum sealer, only compatible with chamber vacuum sealers. Pouches measure at 14 inches by 16 inches. Comes in a box of 500. BPA-free, FDA approved.