Battery cases. It's important to have a way to carry batteries without them touching each other. These battery cases are nice, especially if they are going in a bug out bag where weight may be key. http://www.amazon.com/Generic-Bluece...s=battery+case
If you're like me though, and have equipment that gets used daily, and you go through a set of batteries at rate of every other day, you end up buying batteries in bulk, and find that those containers the batteries come in aren't the most durable, especially as they get empty. Rather than paying $6-8 to store 24 batteries, you can pay $3-4 to store 50. Like so:
I found that while the AAA fit in the same case as the AA, the bullet size that fits AA is long enough that the AAA batteries will come out of their slots if the box is over turned. One could just place two layers of cardboard over the AAA side to prevent this. The cases are a 500 S&W for the AA, and 44 mag for the AAA. I'm looking forward to not having piles of jumbled up batteries in my cup holders any more.