Nesco VS-03R 2 Vacuum Sealer Rolls (7.9 x 19.70') Traditional storage methods can allow food containments to seep in. Oxygen-fed mold and bacteria cause food spoilage, moisture leads to freezer burn. And penetrating odors compromise flavors. Vacuum sealing extracts the air and provides a moisture barrier so your food will stay fresh and last longer.Nesco/American Harvest's patented bagging material is specially designed to lock in freshness and flavor by keeping air, moisture, and odors out. The multi-layer construction is tear-resistant and features cross-venting channels on both sides allowing for maximum air extraction. It is BPA free and safe to microwave, boil and freeze. You can even put them in the dishwasher & re-use.