Material: Oxford cloth Size: S:48*30*17cm / 18.72"*11.70"*6.63" M:57*32*20cm / 22.23"*12.48"*7.80" L:63*35*23cm / 24.57"*13.65"*8.97" Color: As shown 1. With innovative expansion design, the capacity can be expanded from 40 liters to 80 liters, meeting your various needs from short trips to long-distance adventures. 2. High-quality waterproof fabric combined with ergonomic carrying system, it is still comfortable to carry for a long time, suitable for both outdoor sports and business travel. 3. Multi-pocket intelligent layout, including hidden anti-theft zipper design, effectively protects your valuables. 4. In line with international cabin size standards with detachable chest strap and waist belt, providing a more stable carrying experience. 5. Minimalist appearance, suitable for a variety of occasions, both men and women can easily control, showing unique taste. Package includes: 1pcs backpack