I want to pack, but I don't need a schoolbag.

One-shoulder bag, as its name implies, refers to the bag that is stressed on one shoulder, which is divided into one-shoulder bag and messenger bag.

If you smoke, you can install your mobile phone, charging treasure, key, toilet paper and lighter. If you are a photographer, you can install a portable camera. If you are afraid of thirst, you can put a glass of water.