LockFresh® is the logical next step in vacuum food saver systems, bridging the gap between standard storage containers and the awkward vacuum sealing devices currently available. Unlike other vacuum food sealing products, LockFresh® is totally self-contained. There are NO appliances to buy or rolls of plastic bags to refill. Each Lock Fresh® canister has a specially designed lid with a miniature bellows that, when pressed, draws out the harmful air and forms a superior vacuum seal. With this patented pump and seal technology, you simply give the tab a few quick pumps, sealing in freshness up to five times longer