There is a portable charging port on the bag. The bag is equipped with a charging data cable. You only need to connect the mobile power cable to the data cable inside the bag. The USB port outside the bag can be connected to the mobile phone to realize charging. The data cable is detachable, and the data cable can be removed when the bag is cleaned, which is more convenient to use. The bag has a security code lock, which can be used on the zipper of the bag. When you go out, you can set a password to ensure the security of the items in the bag. High-Quality Materials: The bag is made of high-quality polyester material, which is waterproof, light and breathable, makes it stylish and durable. Large Capacity: The size of the travel bag is very large, the size is 47*30*14 cm, and it can hold A4 books, computers, cups and other items. The bag has a main bag, a computer bag, and an insert bag, which can sort and place items more neatly and efficiently. Detail Design: The shoulder strap buckle of the bag is made of thick epoxy, hard and wearable, and the length of the shoulder strap can be adjusted. The comfortable carrying webbing and front patch pockets make the bag more practical. Material: Polyester Size: 30*14*47 cm