The eSun eVacuum 3D Print Filament Vacuum Storage Bag kit helps to keep 3D printing filaments away from moisture and dust. With a new USB-powered air pump, it is reliable and easy to use. Product Advantages 1. The vacuum bag adopts double seal design, single-sided embossing treatment, good sealing performance, can achieve the best moisture-proof effect, and saves time and effort when pumping air 2. The vacuum bag is made of BPA-FREE and FDA-certified food-grade PE+PA composite material, strong and durable, recyclable, safe and environmentally friendly 3. The vacuum bag is specially designed for 3D printing filament, which can be adapted to 0.5KG/0.75KG/1KG package of 1.75mm/2.85mm/3mm filaments 4. The humidity card has high sensitivity and can be used repeatedly, so you can know the dry and humidity of filaments at any time Box Contains: Electric Pump x1 Upgraded Vacuum Bags x10 Sealing clip x2 Desiccant x15 USER MANUAL