I'm a bit of a neurotic with OCD tendencies and I just can't stand things being disorderly and also in this case there's the added worry of short circuits (a worry I only discovered after buying this product and being informed that I SHOULD be worrying about it - that's advertising for you) when batteries are lying around. So I just had to bring some order to my batteries that were still new but for some reason were out of their packet. Anyway, who wants to carry a large cardboard packet around with them? This little box is made of a rigid plastic that has some give, but not too much (like the new Tic Tacs container) and the batteries are held in place within it and don't move about at all. The only thing that concerns me is that the clasp hinge is just a thin bit of plastic and I worry that with lots of use it may fatigue and break, but perhaps this plastic is specially chosen so it won't. We'll see. Also it holds four AA or four AAA, but not combinations of the two. Overall this is nice and tidy. Recommended.