Use Nesco Vacuum Sealer Bag Material to reduce food spoilage Polyethene 80% Nylon 20% material Protects food from freezer burn BPA, PVC and Phthalates free and safe to microwave, boil and freeze Multi Layer tear-resistant with cross-venting channels on both sides 50 Pre-Cut Quart Sized Vacuum Sealer Bags (8.6" x 11.80") These bags work great for preparing food with the sous vide technique