Black backpack hooked to the roller board w carabiners is what I do. Have done for a while and it works the best of any others I've tried. I wear size 13.5 shoes so that takes too much room in my rollerboard for long trips. (I refuse to be that guy w the stretched stealth that doesn't fit all the time. maybe I should carry a briefcase in the other hand to more professional. Or maybe brief case w bungy cords wrapped around the bag. Look it's black and white in everyone's manuals. But if you go rouge don't half ass it. Don't be that dude that tells everyone "Idon't wear the hat cause f that policy!" But its packed in a zipper somewhere ready to be donned faster than the O2