Feature: 1. Small bag, middle bag and backpack three-piece design, you can use according to your needs. 2. Large capacity, easy to store laptop, tablet, mobile phone, headphone, glasses, wallet, umbrella, pen, book, etc. 3. Wear-resistant, scratch-resistant and splash-proof oxford fabric, providing all-round conservation for your devices, not easy to fade. Specification: Features: Small bag, middle bag and backpack three-piece design, you can use according to your needs. Large capacity, easy to store laptop, tablet, mobile phone, headphone, glasses, wallet, umbrella, pen, book, etc. Wear-resistant, scratch-resistant and splash-proof oxford fabric, providing all-round conservation for your devices, not easy to fade. Ergonomic design, equipped with telescopic buckle, easy to adjust the length of the shoulder strap, comfortable and breathable to use. External USB port design, you can charge your phone easily. Specification: Type: Laptop bag Color: Black/Grey/Navy Blue/Wine Red( optional) Fabric: Oxford cloth Inner material: High density nylon fabric+polyester lining Applicable item: Laptop, tablet, mobile phone, glasses, wallet, umbrella, pen, clothes, book, etc. Small bag size: 18 * 11 * 1cm /7.09 * 4.33 * 0.39in Middle bag size: 24 * 21 * 5cm /9.45 * 8.27 * 1.96in Backpack size: 42 * 29 * 14cm /16.54 * 11.42 * 5.51in Packing list: 1 * Small bag 1 * Middle bag 1 * Backpack Package List: 1 * Small bag 1 * Middle bag 1 * Backpack