EXTERNAL DIMENSION 15.75 11.81 4.72 inches; Volume: 15L. DURABLE FABRIC Made of 100% polyester PU coating and the liner is made of 100% polyester, which makes the backpack lightweight, waterproof, water repellent and anti-tear. COMFORTABLE All the straps are widened and thickened which make this backpack more comfort to wear. The handle included for easily carry. SIDE POCKERTS WITH ZIPPER AND SCREEN CLOTH The side pockets with mesh screen have large capacity and the second layer with zipper, can fix the pockets when you put snall stuffs in. APPLICATIONS This bag can be used as backpack and hand bag. Ideal for city casual, school, travel, camping and hiking.