Thank you for your response!

I know I won't need a 41qt for quite a while, but I'm going to buy all of the tubs at once and store any extras because I have read quite a few threads in which people are having problems finding the same size tubs because the suppliers have discontinued the line they were using....

And I'm planning on building the whole rack (and boy will it be heavy) out of 3/4" Melamine. I want this bad boy to last years! LOL.