Nothing saves the day quicker than a handy safety whistle. The next time you set out on an adventure, grab the Whistle Buckle by GEAR AID. Featuring a 3/4&&';;&&';; side-release sternum strap buckle with built-in safety whistle, this buckle replacement kit requires no sewing. Stabilize loads, while staying safe with the Whistle Buckle. Multipurpose - Replacement buckle kit is compatible with most packs and features a built-in, high visibility safety whistle for emergencies Convenient - The standard 3/4" buckle with quick attach tri-glide allows for no sew installment