Hi NZ,



I'm very surprised to hear you say that as my experiences have been the complete opposite. Likewise, the private breeders I've contacted using the CB-70 and CB-110 have raved about them.



I suspect the flexibility problems you mention are from using these tubs in racks with rails rather than sliding on a shelf. The Iris boxes have to be trimmed slightly to allow for this - not something I would recommend.



I checked out the Container Store tub and the CB-70 side by side at the Denver-area store. The CS tub was flexible and easy to twist. Much more so than the CB-70.



Also, I've been using the CB-80 for a semi-arboreal species and have been very impressed. With the extra height there would be more flexibility than a shorter box but it's still extremely rigid. It's the best box of it's size I've used.



To be fair, I should say that I have no practical experience with the CS tubs. I've used tubs with feet for other projects and decided to avoid them whenever possible.



I'll also add that the CS tub was not necessarily a bad tub. It was clearly better made than many other tubs on the market. But when the CB-70 right next to it was more rigid and straight there was no question.



Lastly, I agree that the floor area you listed for the CB-70 is smaller than I'd prefer to use for a BP (I measured it but did not write it down). If I were building a BP rack I'd go with the CB-110 but not use it in a rack with rails for the box to slide on.

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