I have Travel Pro Flight Crew 5 22"
https://crewoutfitters.com/default/t...ollaboard.html
It just barely fits in the overhead bin, so I wouldn't get anything bigger (I think even the expandable version for $10 more would have a difficult time fitting). Really though you can get whatever size you want because we put our bags in the Rear Aft storage area and there's plenty of room there, but if you're traveling on anyone elses metal, this is a good size bag that will fit pretty much everyone's carry-on requirements.

For a flight bag I use the Travel Pro Flight Crew 5 Tote
https://crewoutfitters.com/default/t...ight-tote.html
It fits everything I need to carry with me, headset, some food/snacks, extra forms/folders, pens, sunglasses, etc. But anything the size of this bag will fit in the small area between the seat and the wall.