So just in case anyone is planning to order, there are 2 different size drawers. There's the 18x12x3 and the 12x9x2. I have both sizes. Originally I was one 18x12 short, ie, I had a spare slot, and I had 2 extra 12x9 cases. So I ordered 7 18x12's, a 6 slot rack, and 4 of the 12x9's and a 6 slot rack. Apparently I missed that the first 6 slot rack was for the small drawer cases, so now I have 6 18x12 cases with no home, and an empty 6 slot12x9 rack. They don't make a 6 slot 18x12 case, so to make it all work, I had to order 2 of the 4 slot racks, 2 more 18x12 cases, and 6 more of the 12x9 cases. I shouldn't ever need any more space for the rest of my life.