stranger things teenage backpack for boys girls luminous school bag usb charging anti-theft and waterproof backpack for school t200326

package includes: 1 backpack, 1 3.5 interface cable, 1 usb,1 x trick lock; material: canvas and polyester how to make it luminous. 1.this backpack needs to absorb light in the daytime and shine at dark. 2.the longer the backpack absorbs light,the longer the backpack in the dark glow time. 3.you need to carry it in the sun for some time.and then walk to the dark place. 4.then it will be glow blue. if you want to use external usb charge function, you have to do as follows: 1.buy a mob...