In a good PVC cage you should have no problem holding humidity.
Why 12 inches tall though? I find those difficult to get in and clean well. I can either have my arm in or be looking in... But my both. I prefer nothing shorter than 14 inches tall. I'm not a small person though so maybe it will be easier for you.
24*12*12 also seems small to me to use the Ball's entire life. I'd get the larger one.
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