Sternum Straps For Backpacks 1-pack,Adjustable Chest Strap with Emergency Whistle Buckle Suitable for Universal Outdoor Fabric Backpack Straps(Black)

Keeps shoulder straps of your backpack securely in place, and gives your hands free.Keeps shoulder straps of your backpack securely in place, and gives your hands free.Easy to whistle and make a loud sound in the open air, Ideal for many outdoor activities.No sewing required. you can adjust it to your expected length.Lifetime guarantee and replacement on failure due to manufacturer’s defects. excellent for everyday use. excellent materials and excellent craftsmanship ensure long-lasting durability.