right now I carry my extra batteries in my bug out bag battery boxes I picked up from organize-everything.com.

http://organizeeverything.mercadosearch.com/Search.aspx?free_text=battery%20holder


I also have this nylon case for a few batteries to carry on my person, although I haven't started carrying them daily yet because I have my bug out bag with me at work.

http://www.greenbatteries.com/nylbatwal.html