These 7x9 3mil vacuum sealing bags are made from nylon with EVA as an additive, which draws the package tight around the product. These recyclable 7" x 9" .003 vacuum seal bags are great for dehydrated vegetables, for packaging meat and cheese, for storing clothes and many other purposes. These vacuum pouches 7 inch by 9 inch bags are sealed by various types of heat sealers that specialize in various applications, and they meet FDA requirements for use in food packaging and storage applications. All vacuum pouches are certified Kosher.