Canisters
 

Found these in the local Army Surplus store. Aluminum tubes meant for storing cigarettes:
http://possu.smugmug.com/photos/18771319-M.jpg

10p piece as a comparison, about 3"/75mm long with a screw cap. Cost 25p each, great for storing little things on long trips.

If anyone wants any, let me know. I'll provide them at cost plus postage. Apologies for the crap photo.