Product name: Business travel backpack, waterproof, with UCB connector, with headphone cable outlet USB charging: External USB charging interface, built-in mobile power port, hands free, charging while walking, small innovations are great and convenient. You can charge the mobile power adapter directly through this small connector without the remove mobile power supply. The hidden interface can prevent rain from washing itself and the lifespan is longer. Headphone Hole Design: A headphone hole design allows you to free your hands to listen to songs and make calls anytime, anywhere. Waterproof: The material consists of scratch-resistant, wear-resistant and water-repellent materials and is extremely tear-resistant. Ergonomic design: The shoulder strap corresponds to the ergonomic design, the shoulder strap is breathable, elastic and decompressing, and the wearing experience is comfortable and relaxing as well as breathable and decompressing. When the backpack is heavy with this design it can distribute the total weight effectively and relieve the shoulders. Large capacity: Humanized space that offers space for daily needs and allows you to travel comfortably Usage: Suitable for any occasion including school, travel, hiking, conference, work, etc. Size: width 30 * height 40 * thickness 12cm