Product information: 

Capacity: 56-75L
Bag internal structure: Zipper pocket
Opening method: Zipper
Applicable gender: Male
Material: Polyester (polyester fiber)
Whether with lock: No
With or without rain cover: None
Function: Breathable
Hardness: Medium
Style: Urban simplicity
Lining texture: Oxford spinning
Accessories type: Backpack shoulder pads
Number of shoulder straps: No shoulder strap
Popular elements:Car suture
With or without lever: No
Series: Other
Carrying system: Nerve bridge technology
Scene: Travel
Color: Black, white gray, dark gray
Is there back cushion cotton: No
Waterproof degree: No waterproof
Accommodate computer size: 16 inches

Big size:
Height 50cm* Width 35cm* Thickness 19cm
Medium size:
Height 47cm* Width 33cm* Thickness 17cm