I use a travel pro suitcase like the ones used by the flight crew. It is maximum size allowed for carry-on and my CLs, can, head and breathing hose, and 1st stages fits in it. Try not to make it look as heavy as it is because it weighs more than allowable for carry-on and don't let a stewardess help you put in in the overhead.
I use a Travelpro carryon as well. They're nice and nondescript and offer some protection if you get busted and have to check it.