High-density and waterproof nylon fabric: The waist bag uses high-density and waterproof nylon fabric. It is durable and scratch-resistant, blocking water molecules to protect the contents of the bag. Adjustable buckle and PVC buckle: The fanny pack's shoulder strap has two sturdy buckles. One is the adjustment buckle, and you can adjust the shoulder strap to fit your size. The other is the PVC buckle, which is easy to disassemble, and it is not easy to break after long-term repeated insertion and removal. Unique headphone cable hole: There is a headphone jack on the right side of the running bag. You can put your mobile phone in the bag to pull out the headphone cable when running, cycling, or exercising, so you can listen to music while exercising. And will not damage your headphone cable easily. Lightweight and foldable: The dog walking bag weighs only 60 grams and has a thickness of about 1 cm, which is very light. It fits close to the body and is comfortable to use without shaking, allowing you to exercise without restrictions. When not in use, it can be folded and stored without taking up extra space. Three different ways to use: You can use the small sports bag as a waist bag, chest bag, and shoulder bag. The three-layer design makes it convenient for you to classify and carry different items, such as mobile phones, ID cards, transport cards, wallets, change, power banks, and keys, etc.