Genuine VacMaster 30767 4 Mil 8 Inch by 20 Inch Vacuum Chamber Pouches Includes: 1000, 8 inch by 20 inch pouches per box Heavy-duty 4 mil thick material, Nylon/Poly construction for high puncture and abrasion resistance Use with Chamber Vacuum Sealers only! Pouches can be frozen, refrigerated, microwaved, boiled, or cooked sous vide BPA-Free and FDA approved