Oil Bottle Holder
Clamp it, in the work shop for those who have benches made from dexion and if not just screw a small piece to any existing bench. just hang it off an open car window to put tools and bits and piece keep then out of the way and safe.
You want a pen holder you can't knock over hangs of you filing tray so you will never knock your pens over again.
Even hangs in the shower just drill a few hole in the bottom for drainage. and you have some where for your toothbrush, toothpaste, shaver, combs and more