Item Type: Filament Dryer_x000D_Material: Plastic_x000D_Vacuum Storage Bag Size: Approx. 33 x 30cm / 13 x 11.8in_x000D_How to Use: _x000D_1. Put the filament into the bag_x000D_2. Seal with a clamp_x000D_3. Put the hand pump on the air valve and draw out the air 1The product works for helping you to store the filaments dry. Clean and can also be used as food packaging 2When 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 use 3This bag can be reused for many times, energy saving and environmental protection, very practical 4Moisture?proof vacuum sealing bags can keep the filaments of for PLA 3D printer parts dry 5Excellent plastic material, durable, come with air pump extractor, convenient for you to use when sealing 20 x Vacuum Storage Bag 1 x Air Pump Extractor 1 x Clip