I have been looking at this too. I recently found an old .22 caliber Daisy pellet box. It is basically about the same size as a brass snuff box, but the lid screws on tight. I am thinking that I will add a peice of inner tube to the lid so that when the lid is tightened down it will squeeze the inner tube and sort of act like a gasket. The inner tube will also work as an emergency firestarter too.