This bag is an investment, let's face it, its not cheap. But, you really do get what you pay for with this one.  It is extremely durable and versitile.  I travel at least once a week for my job and that means alot of flying. Until you've had to unload and re-load your computer and your ipad for every security check you can't even begin to understand the amazing, brilliant and wholly awesome feature of the TSA approved unzippable feature (watch the video).  Seriously, the bag is worth it just for that feature but when you add the size, the quality of fabric, the way the strap adjusts (watch the video) its just about the best bag I've ever owned.