Looks like similar measurements to a 32QT tub which can usually house an adult male or a female up to 1500-1800g (most ppl like to go to 41QT after 1500g). Wal-mart and target have alot of tubs. Target seems to have better ones for building racks though. My rack can hold 3 diff tub sizes that are sold at target. I can arrange it in any combo I like and change it as my tub needs change.