Ski brakes work great on packed snow...but if your bindings release in deep powder, you may need a metal detector to find "em again.
Attach one end of these bright 4" long nylon leashes around a ski brake arm and tuck the rest under your pant cuff.
If you tumble out of your bindings in deep powder, the leash will stream out and flag where your ski lies buried under the snow for faster, easier ski retrieval.