A. This backpack is designed for casual travel scenarios, combining large capacity and versatility. B. It is made of Oxford cloth, which is durable and has good waterproof performance. Whether it's light rain or accidental splashes, it can protect the items inside the bag from getting wet. The bag body features a solid - color pattern, paired with popular stitching elements. Its overall style is fresh and sweet, meeting different aesthetic needs. C. Its capacity ranges from 20 to 35 liters, making it suitable for carrying various items during casual travel. It can hold a 16 - inch laptop, which is convenient for those who often need to carry a computer while traveling. In addition, it is equipped with a USB port, allowing you to charge your electronic devices at any time during the journey without worrying about running out of power. D. The backpack's carrying system uses an arc - shaped shoulder strap design that conforms to the curve of the human shoulder, effectively reducing the pressure when carrying and ensuring that you won't feel overly fatigued during long - term travel. The lining inside the bag is made of polyester fiber, which is soft and comfortable and can provide good protection for the items in the bag. This backpack combines practicality and fashion, making it a good choice for casual travel.