One more important point that a few of you mentioned that really resonated with me is that having a carry on bag, whatever kind, that you KNOW will qualify as carry on for sure is paramount. Not having to fret about whether your bag fits or doesn't fit is a pretty big deal. I look for as little stress as possible when travelling so I'd encourage anyone considering buying a carry on bag to make sure it truly is just that. One less thing to have to worry about.