YYST Universal Fixed Loop Adjustable Sternum Strap/Backpack Chest Strap with Quick Release Buckle Chest Clip 1. Keeps Shoulder Straps Securely in Place .That gives your hand free. 2. Compatible with most backpacks with removable/adjustable shoulder straps up to 10 cm/4 wide (Approx) - Extends to Approximately 16" in length 3. Manufactured from rot resistant 25 mm (1 inch)polypropylene webbing 4. Black Quick Release Buckle. New and Never Used 5. The D ring is especially designed for you to pull the strap more easily. you can also hook some light things on the D ring.