These vacuum chamber pouches from VacMaster (model ary-40725) have a standard thickness of 3mm and ship 250 to a box. These bags each measure 10 inches by 13 inches and are designed for use in chamber vacuum-sealer machines. Bags are puncture-resistant and have been designed to readily accept a tight seal when used on chamber machines. It is well known that vacuum-sealing keeps stored foods fresh for over five times longer than foods stored without being vacuum sealed, and prevent freezer burn. These nylon/polyethylene bags are F.D.A.-certified and B.P.A.-free and may be stored in a refrigerator or frozen, and may also be microwaved and boiled, and are ideal for culinary heating in a sous vide bath. The high quality construction of these bags insure a high level of transparency; vacuum-packed items are clearly visible through the pouch.