Our FoodSaver® Vacuum Zipper bags are designed to work with the FoodSaver® Handheld Vacuum Sealing System. The FoodSaver® Vacuum Zipper bags are made with a reinforced double-track zipper and multi-ply material with air channels that help push the air out of the bag. Each bag is constructed of durable, BPA-free, multi-layer plastic to help keep air out so foods stay fresher, longer.