LED APP control backpack waterproof—W10Features: DIY Modify the pattern at will, let the laptop backpack as you wish. It has a sleek and cool design that's easy to spot in a crowd. The Crelander LED cool knight smart backpack is suitable for a variety of scenes,like traveling,hiking,riding,go to school. Multipurpose: LED backpack size is about 15 * 7 * 18in which have enough storage. Large zipper pocket as a laptop bag, put a tablet computer; the interior has a number of independent small