HBAG 20" Sling Backpack Single Strap School Travel Sports Shoulder Bag Made of light weight and water-resistant material One large main compartment is enough for books and binders (thick books or a basketball can easily fit in) One zippered mid pocket for accessories One front pocket for keys and cellphone; water bottle holder on one side One inside zippered pocket for wallet and media player such as Samsung Galaxy S4, mp3, CD player, or ipod. With earphone port