Ok sorry to be posting yet another "What size tub do I use?" post but here goes...

I have seen a lot of guys using 28 and 32 qt sterilite tubs for their racks and my question is this. At roughly what weight do you change your adults into 41qt tubs? I was in target today looking at tubs deciding what to use to build my rack and 28qt tub look really small for any animal that has very much size to it. I am just getting started on my collection and most of my animals are smaller right now but I have a few 1000-1500 gram balls and one female around 1800. Now, ideally I would like a hide on both ends and of course a water dish. I really can't see all that in a 28 or 32 plus a snake that's got much size. What size do you let your snakes get to before you step up to 41s? Or is the smaller tub actually better and I'm stressing over nothing? Thanks in advance for your help.