Co-Extruded Vacuum Packaging. Size: 14 inch W x 20 inch L Material: LDPE/Nylon Color: Clear Gauge: 3 mil Closure: Open endedQuantity: 500 pack These vacuum food bags are made of a high-quality materials. Made of polyethylene and nylon and they are durable enough to resist punctures and abrasions. Nylon is an outstanding choice for heavy duty performance bags. In foodservice they are the preferred material for maximum vacuum pouch durability - such as storing and preserving meat product in long duration cold and freezer storage. These vacuum sealer bags extend shelf life for a variety of food products. You can prepare meals in advance, pack up and freeze them instead of letting them go bad in your refrigerator. The vacuum sealing preserves the aroma, freshness, taste of cookies, fish, fruits, meat, vegetables or other food items for later consumption. Store fresh or frozen food 2-3 times longer to reduce waste!