Fit perfectly under seat of smaller American Airlines jets on recent trip. Easier than most underseat bags to remove during flight and access items. It fit under seats that our other carry on bag (that used to fit under all seats) could not.  Lots of interior and exterior compartments for organizing items.  Deducted one star because two straps that form handle have to be velcroed together, and the fit is not perfect. You need to find each strap and pull them up and attach the velcro around them, then any time you need to access the telescope handle to roll the bag you have to detach velcro and separate straps.  Not a huge deal, but design is not as convenient as it could be.