I have flown a UA
EMB 170 and the bins in economy could take full sized roll a board suitcases in, but only sideways. They couldn't fit them in wheels first. However in first class the bins on the side with 2 seats are enlarged and are big enough to fit a roll a board suitcase in wheels first. The bins are shaped a little differently, but almost the same size as old MD
-80 and DC-9 bins.
Here is the trip report with a photo of bins:
If you have never designed an airplane part before, let the real designers do the work!