The Premium Chest Strap upgrades any Boundary backpack by providing enhanced support and comfort. It features a Fidlock magnetic buckle for quick, easy fastening and removal, along with aluminum toggles and YKK® snaps to secure the sternum strap in place. When not in use, the buckle can be stored conveniently on the included magnetic clasp, which attaches to the shoulder strap, keeping everything organized and accessible. Specs Dimensions: 25mm soft, nylon twill webbing."" Capacity: 5 L Weight: .14 lbs / 65 g Features Aluminum hardware toggles and YKK™ snaps – Secure the strap to Boundary backpack shoulder straps, adjustable for different heights. Magnetic Fidlock buckle – Provides easy, secure use. Included magnetic shoulder dock – Keeps the buckle stored when not in use. Shipping + Returns Enjoy free 2-day express shipping on U.S. orders $100+ and fast international shipping on orders $400+. Learn more . 30-day return policy . "