" Package Include：Backpack Chest Strap *2 Sturdy: Adjustable shoulder straps, the backpack strap won't slip off Adjustable length: The length of the sternum strap of the backpack can be freely adjusted, suitable for backpacks of most sizes Quick-release buckle: Each backpack chest strap is equipped with a durable quick-release buckle, making it very convenient to fasten and unfasten Service:If you have any question, please just let us know, we'll help you to solve it asap "