Specification: Material: Oxford cloth Lining texture: polyester Product size: 21x33x51cm / 8.2x13x20in (Large size + waist pack) 20x29x47cm / 7.8x11.4x18.5in (Small size) Capacity: 36-55L Weight: 1.8kg Package internal structure: ID bag, mobile phone bag, laminated zipper bag, zipper pocket, computer pocket Opening method: zipper Applicable gender: neutral / male and female With or without rain cover: Yes Function: waterproof, breathable, wear-resistant, anti-theft, lightening, shockproof Accessories type: other Strap root number: double root Popular elements: other Lifting parts: hard handle Outer bag type: inner patch pocket Bag shapes: square vertical section Package Content: 1 x OZUKO Waterproof Laptop Backpack 1 x Rain cover Note: 1. Please be aware that there may be a 1-2cm error due to manual measurements. 2. The product picture is taken in kind, and it is normal to produce a certain color difference due to factors such as ambient light and different resolutions of each display. Quality Service: If you are not satisfied with the quality of the product, we will give you a full refund. If you have any questions, please do not hesitate to contact us as soon as possible. Customer satisfaction is our main goal!