Feature:1. The product works for helping you to store the filaments dry. Clean and can also be used as food packaging2. When the filament is exposed to humid air for a long time, it will become brittle and fail to print. A vacuum bag is a good way to solve this problem, you can keep it in a vacuum when the filament is not in use3. This bag can be reused for many times, energy saving and environmental protection, very practical4. Moistureproof vacuum sealing bags can keep the filaments of for PLA 3D printer parts dry5. Excellent plastic material, durable, come with air pump extractor, convenient for you to use when sealingSpecification:Item Type: Filament DryerMaterial: PlasticVacuum Storage Bag Size: Approx. 33 x 30cm / 13 x 11.8inHow to Use: 1. Put the filament into the bag2. Seal with a clamp3. Put the hand pump on the air valve and draw out the air.Package List:20 x Vacuum Storage Bag1 x Air Pump Extractor 1 x Clip