The stock HDZero strap was never comfortable for me. Too wide, never sat right, and swapping batteries between packs meant wrestling the whole thing off my head. The KKCOBVR halo strap solves the comfort problem on its own, but I needed an adapter that would let the HDZeros actually take advantage of the built-in flip-up hinge. Flipping up between packs is exactly as convenient as it is in VR. If you build one I'd love to see photos.