Nesco/American Harvest's patented 11 in. x 26 in. bagging material is specially designed to lock in freshness and flavor by keeping air, moisture and odors out. The multilayer 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 reuse.