Let's start with the important part.  It fits the metal sizers at the airport gate.  I went to the Burbank airport and tried on sizers at Southwest, Alaska, US Air and United (TSA guys looked at me funny)  No problem with any of them.  The actual overhead bin may be bigger but you must fit the sizers these days to avoid the fee!  just so you all know, the actual exterior dimension is (I measured it three times) is 9.5 inch depth, 22 3/4 inch height (call it 23 inches if you include the leather handle), and 14.5 inch wide including wheels.  This is with clothes packed full in the main compartment and with a suit in the suiter.  But nothing in the front pockets.  YMMV. ............. Oh and the suiter.  I had a problem with the 20 inch carry-on's because I couldn't fit my suit jacket in there flat (size 44 L).  There is just enough in this bag to do just that.  ----------  The best part:  You can cheat a little to expand the bag.  You don't have to lock it at full expanded depth of the bag.  You can just unhinge the locking mechanism and give yourself a 1/2 inch or an inch of additional depth if you need a little more space. It won't stay at exactly at that depth but the amount of clothes you have in the bag will ultimately determine how much it expands.  Everything is sturdy and top quality.  .......... lastly remember that this thing weighs about 11 lbs.  It's not for my mom or for little weak dudes with tiny wrists who push around spinners with very tight pants.  It's for frequent flyers who travel with a purpose.