Double ZipperDual zipper design provides double sealing capability for those bags to ensure an airtight closure. When you close the zippers, the yellow line will be inserted into the blue lines, indicating full closure. Stay-on clip prevents falling off the zipper. | Triple Seal ValvePLATZSPARER vacuum storage bags come with triple seal valve, provides air isolation for long term storage. There is a cap each valve to impact the rubber stopper. The Internal thread confirms that the cap is completely secure and tight. (NOTE: Do not remove the rubber stopper) | Derable and ReusablePLATZSPARER vacuum storage bags are made with 2-Layer composite material, PA&PE with high seam strength, high puncture resistance and better sealing performance. | Extra Thick FilmThe vacuum seal bags are made of extra thick and flexible plastic film ,manufactured under the strictest quality control standards, ensuring repetitive uses,please keep in mind Keep sharp parts away from film. |