I use one for all my Terrestials, I just got it last year. I like it a lot because you can readilly see what is in it. I am thinking about getting the large one for another box. It is a little wider than many of the slimer boxes i have used, particullary the foam ones. Also it is a little heavier than some. If you only carry aone or two boxes shouldn't matter. If you are one who carries a half dozen or so the bulk might make a difference.