Outer Material:Oxford Fabric ,waterproof, wearproof, easy to clean. Inner Material: Oxford Fabric. Capacity: back large capacity main bag.They can hold enough products,like Ipad, umbrella, wallet, water bottle, books,and so on. Anti-theft Design: The large back zipper main pocket can keep your valuables from being stolen,which makes you do the shopping for more comfortable and safer. Multifunction:The strap of backpack is adjustable.You can carry it as a shoulder bag or backpack. The style is changeable, useable. and fashion. OccasionPerfect for sport,shopping, working, school, dating,travel or any other daily occasions.