describe: Material 70D*200D nylon physical dimension: 46X31X 15cm colour: black purple weight: 1.12kg Computer size: 15.6 inch capacity: 19L Packing: 1*backpack 1. Selected polyester fabrics, comfortable to touch, Strong, wear-resistant, tear-resistant Rainproof, Even if the thick good fabrics are empty, they are quite stylish 2. Two-way anti-theft zipper Double-layer four-wire two-way reinforced anti-theft zipper Strengthen the anti-theft on both sides, high security Scratch-resistant, stab-resistant, smooth and easy to pull, long service life Regarding chromatic aberration: All products are taken in kind, and the designer uses a computer The color is subject to the actual product, However, due to the different screens of mobile phones and computers, the color difference is more obvious The display is slightly different, not a color difference problem: About size: due to manual measurement, there is an error of about 2-4 cm This is a normal phenomenon, subject to the actual product Cleaning skills: It is best to scrub when cleaning the bag Never use a washing machine for cleaning