The Pacsafe Citysafe 350 Gii is very nicely made, but turned out not to feel appropriate for the way I travel.  Even though the straps are wired to help prevent cut and run thefts, I found I was not comfortable having the pack on my back out of sight.  I prefer a sling bag that allows the strap to diagonally cross my chest so the bag can be dragged around to the front when I feel the necessity (ie, in a crowded train station, or subway station, etc).  Also, the pack has fewer pockets than it should.  Might be very nice for someone else, but not for me.