1. This bag uses high-quality Oxford cloth, which is thick and sturdy, ensuring that it will not be easily damaged; 2. This bag is exquisitely crafted with neat and dense stitching, ensuring that the connection points of the bag do not easily come off and are aesthetically pleasing; 3. This bag uses a high-quality zipper head (smooth zipper that opens in both directions for smooth silk) and a zipper strap, never slipping silk; 4. The backpack has 2 mesh side pockets on the left and right, which can accommodate water bottles and small umbrellas; 5. There is a circular telescopic loop in the middle of the left shoulder strap that can be used to hang glasses; 6. There is a hidden anti-theft pocket near the lower back to protect your valuable items from theft; 7. You can put this backpack on a trolley and push it along to reduce the pressure on your back.