i carry my cpap in a separate cabin bag (Tumi wheeled deluxe brief) along with the lithium battery and my meds.

in the US, that is allowed in addition to my carryon .

IB gave me a very hard time saying I had to check the carryon. Is that correct? One bag limit and if you have medical equipment that counts?(of course, I could have gotten by with just the CPAP bag; that would have been smaller than the Tumi rolling brief).

i was in economy, connecting from TATL business class on IB