Extra thick plastic It comes with 5 bags, small(2 pieces), medium(2 pieces), large(1 piece). Small - 50 cm x 70 cm. Medium - 60 cm x 80 cm. Large - 80 cm x 100 cm. 1 Suction Pump. With the triple-seal turbo valve & double-zip seal design, our vacuum bags get the air out in the suction process. Can be used repeatedly. 1.With the double zip seal and airtight valve, as well as being made from extra thick plastic, you can rest assure that no air ever gets back into our space saver bags and that they remain 100% compressed until you decide to open them again. 2.The secure, water-resistant storage bags protect the contents against odor, insects, dirt and mildew; seal in your clean, dry clothes and retrieve them when you need them. 3.Our vacuum storage bags are essentials for both household space saving and travel organization. Function as storage bags for clothes and compression bags for travel.