i have an animal plastics hatchling rack, the 45 tub one, i got to say they are worth their money, very easy to put together, everything is tight, yes you have to get the tubs through another source, but it is really not a bad thing since they (A.P.), give you the links to the tubs in the product description of the racks. out of the the tubs sizes for the adults, i would say the CB-70 or the iris tub # 10008765, Dimensions 35-5/8" x 18-1/4" x 6-1/4" h, we will be going with the Iris ones ourselves for our adults since we are very happy with the way the smaller iris tubs are made, they are not brittle like the rubbermade, sterilite or the holmes tubs.