3-way plastic back strap adjuster pad, also known as hexagon webbing adjuster, baby harness webbing keeper, baby carrier accessory, belt strap buckle, backpack strap keeper buckle, etc.
Four way strap adjuster for webbing use, match with 1-1/2" (38mm) straps, rich in elasticity so it is resistant to bending, this strap divider is used to hold straps from four directions in place.