Feature: 1. Shoulder strap design--The honeycomb design of the shoulder strap of the bag is comfortable and breathable, and it is not stuffy after long-term use. 2. Triangular reinforcement design - the bag is reinforced with triangles, which is strong and durable. 3. Scientific stratification, reasonable storage, and large capacity to meet travel needs. Specification: Material: Polyester; Fabric: Nylon fabric; Structure: Main pocket, front pocket, side pocket, back pocket; Size: Backpack: Width 32cm* height 45cm* thickness 13cm; Shoulder bag: Width 21cm*height 24cm*thickness 7cm; Pen pocket: height 10cm*width 20cm. Notes: 1. Due to different displays and lighting effects, the actual color of the item may be slightly different from the color shown on the picture. 2. Due to manual measurement, please allow 1-3cm error. (1 inch = 2.54 cm) Thanks for your support :)