Package internal structure: Zipper pockets, mobile phone pockets, ID pockets, sandwich zipper pockets, computer pockets Number of shoulder straps: Double root Types of accessories: Tie rod Applicable gender: Unisex / both men and women Opening method: zipper With or without tie rod: Yes Lining texture: Polyester pattern: Solid color Lifting parts: Soft handle hardness: Medium to soft Applicable school age: primary school capacity: 20-35L Features: Breathable, waterproof, abrasion-resistant, shock-resistant, lightening style: College style popular elements: Sewing thread colour: Royal blue two rounds, sea blue two rounds, red two rounds, rose red tw