I looked at the bag yesterday in person and just love it- I was originally torn between Tivoli gm, Monty pm and the Gallieria pm, but now it will be the Gallieria (after rigorous savings!!). Some observations I made: The inside pocket is big enough to hold the Koala wallet-without problems but wouldn`t be big enough for anything bigger.
I could put put my things into the bag to try it out, and I could fit into it: wallet, medium agenda, big paperback, mobile, pochette (was filled with lots of make up, handcream and other things) big keyring. I could close the magnetic snap and it hold! But it would be hard to put more into it, maybe a couple of little things. But even open it felt secure because of the opening right under my arm.
The Gallieria gm was really big- and I could get my macbook pro into it-had to put it in upward (opening otherwise to tight) but inside could put it around and still had plenty of room and could close the magnetic closure-great alternative for traveling!