I just received my new large organizer. Wow! Is it big. I have 44 stamp sets in it, and I can easily read their labels. As a comparison, I have the original My Acrylix organizer beside it. The original box holds 15 stamp sets comfortably.
It looked like there was quite a bit of extra space on top of the organizer once I closed the lid. So I got out my My Acrylix block foam insert and put it on top. Look, it fits in there perfectly! However, the stamp blocks made the organizer rather heavy. The handle and latch would probably take the weight of the new craft boxes much better.