I do Walmart but I build my racks with lids on.
The new rack uses the 3 quart for hatchlings, it had the same footprint as the 6 quart without the height.
Step up tubs are 6 quart with twice the floor space of the standard 6 quart shoebox.
These are the 3 quart
Everything else is 28 or 41 quart
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