1、WATERPROOF FABRIC: Knitting bag backpack's fabric is splash proof and dirt resistance, rainwater can't soak into the inside of the bag to guard the yarn and knitting tools from getting wet. 2、UNIQUE DESIGN: Yarn backpack using three line hole design, wool regular not mess, at a glance, more convenient to take things, independent small bag, storage small tools. 3、WIDEN SHOULDER STRAP: Crochet bag backpack adopts 5.5CM wider straps, scientific triangular pressure relief, three point balanced force, reduce shoulder and neck strain caused by prolonged back. 4、LARGE SPACE: The crochet knitting bag backpack has a spacious main compartment for unfinished projects and a separate internal pocket with matching holes on the side to prevent yarn knotted. 5、CONVENIENT CHARGING: The crochet bag backpack has a built in USB port on the outside and a charging cable on the inside, this USB backpack offers a more convenient way to charge your cell phone while walking.