Yes, I too have a lifetime supply of crushed walnut shells. I keep mine in a big ziploc bag inside of a plastic container with locking handles. I want it to be nice and secure, because once I tried to fill one of my pincushions while sitting on my bed. Please DO NOT TRY THIS MANEUVER AT HOME. And please don't ask me how I know it's not a good idea.
If you see me out somewhere and there are crushed walnut shells stuck to my butt, feel free to let me know.