Antai Metal is the leading manufacturer of first-rate quality vacuum seal bag with more than 15 years experiences in design and production. Our vacuum seal storage bag already obtained patents in USA, Taiwan, Japan, Korea, ***** Our vacuum storage bag is equipped with patented device of "automatic seal airtight air check valve" to provide convenient and safer operation during the application. Simply vacuum the air inside the bag and the automatic air-seal device will immediately seal the air valve by itself to keep longer-lasting vacuum, so as to maintain the function of moisture proof, discoloration prevention, anti-dusty, anti-odor, anti-insect and also can save up 75% space.