Thanks for the replys.

Personaly, my 'Ideal container' (I don't know if it exsists though <img src="images/graemlins/wink.gif" alt="" />) is
1)water proof (cell phone bag)
2)robust (altoids/metal container)
3)unatractive (ie. i wont be walking around with big bulge in my pocket)
4) resealable (not like some 'sardine tins' that you find on the market.

I think i'll try get hold of a cell-phone pouch for the moment, and just see what i can find in the future.