This is backpack chest strap, made of high-class polyester, plastic material, is practical and durable for use. Made of sturdy and durable materials, it will not be easily damaged. You can use it with confidence. Small size, easy to carry, easy to store, convenient for you to use at any time. Features -Color:Black -Material:Polyester, Plastic -Size:5.00X2.50X0.50cm/1.97X0.98X0.20in - Use it to tighten the belt and adjust the length. And two buckles. The strap is tightly connected and not easy to loosen even when pulled. - Because of its size, the packing belt folds easily. You can then adjust the length as needed. - The backpacks' chest contains a quick release button, which is easy to open, and you can put your keys. - These please apply to all brands of backpack and shoulder bag, and you do not need to worry about mismatch. Fishing, hiking, camping and so on - You can put your keys, earphones, compass and other small items on both sides of the mounting button. Package list: 1 x Belt 12 x Buttons 12 x Buckles