A standard feature on HMG's larger packs, the adjustable Sternum Strap is also a great addition to the Stuff Pack or Summit Pack. The strap is available in two widths: The 3/4" strap fits all Hyperlite Mountain Gear packs and has self-tensioning elastic for comfort, while the 5/8" strap is specifically designed for the Elevate, Unbound, Waypoint, and Contour packs. Both options feature adjustable webbing and side release buckles with a whistle for safety. Features Distributes pack weight evenly for improved balance and reduced shoulder strain. Integrated whistle provides a crucial signaling tool in wilderness situations. Buckles/Bungees: Side Release Buckles with Whistle Compatible With: 3/4" straps (all Hyperlite Mountain Gear packs) and 5/8" straps (Elevate, Unbound, Waypoint, Contour) Webbing: Adjustable 3/4" and 5/8" Webbing Specifications 3/4" 5/8" Weight 26g 26g Width 3/4" in Webbing 5/8" in Webbing