Was about to pull the trigger on the international wide body expandable U121CXW, then was reading some other older threads on wide body bags which stated they wouldn't fit. Looking at measurement requirements of carry on bags for Delta, United, and American all have sizers for 14 x 9 x 22 inches. Using that the U121CXW would not fit as it's 21" x 15.5" x 8.5" per B&R site (width of 15.5 inches being problem). I would think that since it's only wider and not taller or more deep it shouldn't be an issue to actually fit this overhead as it just takes up more left right space if you put it wheels in. Problem is if they make you put in sizer like:
http://www.latimes.com/travel/la-trb...611-story.html then your SOL

The domestic carry on expandable U122CX however fits exactly at 22" x 14" x 9". Looks like this is one i'll be getting (and will have to use something else for international travel) unless you guys think differently.