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Bag size: large; Capacity: 20-35L; Internal structure of the bag: ID bag; The internal structure of the bag: mobile phone bag; Bag internal structure: sandwich zipper bag; Bag internal structure: zipper pocket; Bag internal structure: computer pocket; Opening method: zipper; Applicable gender: neutral/male and female; Material: Polyester; Whether with lock: Yes; With or without rain cover: None; Function: waterproof; Function: breathable; Function: wear-resistant; Function: Anti-theft; Function: burden reduction; Function: Anti-seismic; Function: night safety; Processing method: frosted; Hardness: medium; Pattern: letters; style: Casual; Lining texture: polyester; Types of accessories: buckles; Number of shoulder straps: three; Popular elements: letters; Lifting parts: soft handle; Type of outer bag: bag with lid; Bag shapes: square vertical section; Whether there is a tie rod: No; Carrying system: Physiological curve backboard; Scene: outdoor; color: blue; Colour: Black; color: gray; Size: 18 inches;