I believe they are petmate large... roughly 16x18. I don't stock all of my tubs the same. It depends on what size of mice I am pulling from each tub as to the stocking count. The racks are mentally divided into sections. Pinky tubs are 2.10, fuzzies are 1.6, hoppers are 1.4, everything else is 1.3.
I havent had any problems with the racks warping or falling apart (one is 3 years old now) but i will not argue against single stacks being sturdier.
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