These vacuum seal bags are made of non-channeled, 3 mil, 9-layer poly-nylon film and host excellent moisture transmission rates (less than 5 g/sq.m) and oxygen transmission rates (less than 45 cc/sq.m). These pouches are ideal for long term packaging (including freezing) of meats, fish, poultry, cheese and other perishable foods. These bags also meet FDA and USDA requirements for food contact. 500/box