Hi sorry I just wanted to say that in regards to the PS1 and the problems of screws falling out etc in my opinion the bag isn't suited for a work/laptop bag at all, even in the large sizes, especially if you over stuff it (which will most likely happen if you use it as a work bag).
I wanted to do the same as well but after reading up about the bag I wouldn't take any chances. For the large sizes your looking at two and a half grand (well in Australian dollars) plus shipping/any taxes if you're importing it and honestly, I don't think any bag that expensive should be used to carry heavy things its just too much of a gamble. If you want to bag to last and not have any difficulties I'd say don't use it as a work/study bag. Keep it fairly light and be gentle with it.
Anyway, thats just my opinion but I hope you do take in some of what I said, I'd hate for you to have problems with such a beautiful/expensive bag.