Iris..Iris..Iris..
I've used tons of different makes and models and iris is by far the best I use iris tubs for babies and juvies. Unfortunately I don't have a source here where I live for tubs any bigger and so I use the 28 qt sterlite for adult corns, appropriate sized boas and the 41 qt sterlite for my male boas and growing females before they go into 4x2 animal plastics.
The iris tubs are completely flat at the bottom and are are easily and quickly cleaned compared to others .
Thanks
Mark Lembke