Dust-proof and Moistureproof: Double seal zipper and single-sided embossing, heavy duty valve, good sealing performance, easy to pump down.Micro porous vacuum storage bags allow maximum air removal and protect the filament from moisture and dirt.Monitoring the humidity of the filament: In high humidity environments, the discoloring agent changes from blue to pink, allowing you to easily monitor the humidity.Clear vacuum bags allow you to quickly check the humidity level of the filament without having to open the bag.EASY TO USE: Put the filament into the vacuum storage bag, lock the ziplock seal with the seal clip, keep the exhaust port on a flat platform, and simply pump out the air. (It is recommended to squeeze out the air first before manually pumping.This makes pumping down easier and saves time and effort. Wide application: Not only can you use it to store 3D printer filaments, but also can be used to store candy, coffee beans, dried flowers, baking, dried fruits, cookies, tea, nuts, etc.