I've been following this thread for a while and the bag in question is very, very close. I
That said, the bag in the film seems to either have been modified or is different. In one scene Depp is looking for something in the bag and there are *two* internal compartments. If there were two the airline ticket would have needed to be folded.
It looks like the two smaller outer pockets have been sewn together and turned into a larger compartment giving two usable spaces rather than one and two next to useless pockets.
In the scene he has the book in the back compartment and he pulls stuff out of the front compartment, passport, pack of tissues, airline ticket etc.
If you look at the picture in this link:
http://www.therpf.com/f9/identifying-dean-corsos-bag-ninth-gate-3899/
you can see that the front two pockets look sewn together to make one big one.
From personal experience of this type of small pocket I suspect this was done because getting stuff out of those small pockets is a pain.
You dive in with your hand and can no longer see what you want. You grab something and then find that because you're holding whatever it is your hand is now too large to pull out of the small pocket without letting go of what you're holding!
Neither practical or elegant having a character fumble in his bag trying to fish something out with two fingers.
Mason