I was really impressed with the quality of this bag.  It just felt durable... perfect for a trip.  And it fit everything I wanted to take with me on my daily outings (tablet, water bottle, notebook, cameras, pens and other incidentals.  But it was just too small for comfort.  The straps felt like they were pulling awkwardly on my shoulders (it was pretty heavy with all my electronics!), and it sat too high on my back.  I couldn't see myself wearing it for almost 2 weeks without getting some major back pain.  Had I needed to carry a lighter load, it could have worked.

I really liked the security zipper (a loop plastic piece tied to the zipper stuck through a loop on the bag, making it much more difficult for a pick-pocket to get in the bag undetected).  That zipper was on the compartment closest to my back.  The next compartment had double zippers, as well.  They were somewhat secure because I could zip it closed with the zippers "parked" behind my water bottle.  The zipper was also hidden by a flap.  The only unprotected pocket was the small one on the front of the bag, where I would keep my small incidentals.