I have been looking for a good way to carry 2 lithium batteries and 2 bulb assemblies for my E2 (one spare incandescent, one LED conversion). I was using the tube that mini m&m's come in, but I didn't like the batteries banging into the lamps. I now use 2 waterproof match carriers, one brass for the lamps (~$3), one plastic for the 2 batteries ($.99). They both claim to be waterproof and have rubber seals. Neither has a good lanyard attachment, so they just get tossed in my bag.