Pentdrago, the case I used is about 4" deep by 8" wide. and about 5" high (tall enough inside for most banner-carrying troops).
It's relatively small, but perfect for a squad of marines and a rhino, a Warmachine battle group, or even a small action diorama.
They're also very cheap, the one I used in the article was $5 at Walmart. There are larger ones available at any hobby store, just look in the model car/plane section.
Thanks for the votes and feedback!