For carry-on purposes, I have flown with the C300 packed into the Pelican 1510. It fits quite well with enough room for lenses and accessories. Plus, if you get put on a small plane, you can gate check the camera and not worry so much about breakage.

Usually, my main concern is having a case I can work out of during the shoot. I don't want to break the cameras down every day if I am not traveling. Soft cases are fine out of the vehicle and allow me to place the camera back into the case when going from here to there by car. The biggest problem I have found is finding a bag that is tall enough, then second to that is wide enough.

The C300 is tall to begin with, then add the monitor assembly and my Zacuto top handle.... all on a vct base. It is very tall. I also have an older Porta-Brace production case 3 that was tall enough to handle the C300 built up, but wasn't practical day-to-day.