50 pre-cut quart sized vacuum sealer bags traditional storage methods can allow food contaminants 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'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 and re-use.