camera in carryon along with regs and computers.
strobe, arms, housing, accessories in a pelican 1650 (came with the strobe) which is then placed inside the biggest softsided suitcase I could find at walmart... and it just fits with a little room at one end for some paperbacks, etc.
it all depends on what housing you have... size wise, and how much other crap you're already carrying-on. There is no way I could carry on the strobe and ike housing... we each take a 'max' size carryon, and they are already stuffed. I tried to fit it all in once and I could do it, except for my laptop. So, I figured at least my way doesn't scream "Look at me!!! expensive crap inside!!!" like a pelican case alone does.