I have most of my breeding pairs in Boaphile cages. I have some that are 3'x2'x11", and I have some that are 2'x2'x18". While I love the visibility afforded by the more cube shaped cages, my boas can't tip their water tubs over in the flatter cages, lol! When I can afford more caging, I will be buying more of the 3'x2'x11" cages.
I also have lone adults, and sometimes a breeding pair or two, in racks using the largest under-bed tub sold at Target. I build my own racks around these, and they work great! I really like them a lot for single adults.
All of my growing BRBs are in appropriate sized racks.
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Aubrey Ross
