The eSun eVacuum kit is ideal for keeping your leftover filament dry. By vacuuming the bags with the pump, you protect your filament against (air) humidity and maintain print quality. The bags are specially designed for spools of filament, close tightly and are compatible with different sizes of 3D filament. The double closing mechanism allows you to achieve the best moisture-resistant effect. The humidity map is sensitive and can accurately indicate how moist the filament is time and time again. The kit is certified by BPA-FREE and FDA and is safe and environmentally friendly.