Really great pack.  It's smaller then my old pack (which is a good thing) and it still holds all the essentials.  Working in a place where your office is your backpack, I needed a good pack.  This pack is very sturdy.  It even has a luggage strap so you can stack it on top of your suitcase.  It has easily fit under seats in everything from an A321 all the way down to a CRJ200.