Mizuno Lightning 2 Backpack Head to the gym with all your necessary essentials in the Mizuno Lightning 2 Backpack. This backpack uses Aerostrap™ technology to enhance the carrying comfort. A front compartment has a pocket for your valuables, and a hook for your keys. Other features include side mesh pockets, an organizer pocket, a hideaway ball pouch, and a footwear compartment. Sz: 18" H x 12" W x 9" D.