Which LEGO boxes are compatible?
There has been a staggering amount of different size and shape LEGO buckets, tubs and boxes. A lot of them are stackable with each other (meaning the same size and shape box produced at the same time can be stacked). I think narowing down the question would be helpful. Are you looking for LEGO boxes currently in production? Or all boxes LEGO ever produced? I just did a quick search on Bricklink and over 300 results came up just for LEGO buckets (similar to the ones you are picturing above): http://www.bricklink.com/catalogList.asp?pg=1&amp;q=bucket&amp;catLike=W It would be huge work to try to work out the compatibility of all of them.