Travel backpack $ 46.36 Capacity: 20-35L Internal structure of the bag: ID bag, mobile phone bag, sandwich zipper bag, zipper pocket, computer slot Opening method: zipper Material: Polyester Function: waterproof, breathable, wear-resistant, anti-theft, burden reduction, earthquake resistance Processing method: printing Hardness: medium to soft Lining texture: polyester Strap root number: double root Lifting parts: soft handle Type of outer bag: digging bag Bag shapes: square vertical section Carrying system: curved shoulder strap