Description Coolbell is a brand of Hong Kong with a factory located in China. Coolbell is distributed in over 25 countries including the US market, our company represents in Vietnam.Material: Super-thick fabric is water-repellent and anti-fouling, Dust-proof and scratch-resistantThe backpack is equipped with a USB port and a connection cable to help you charge the battery even on the go, the cable inside the backpack you plug in with your power bank or laptop and at the end of the strap of the backpack there is a ush port, you Plug in the phone charger.