Last week
@Morgan_Bellini ordered me to take one for the team, and who am I to defy her?

So here's my verdict regarding the capacity of the large Saddle Pouch, maybe it will help someone make an informed decision down the line. See the rehab thread for some extremely unspectacular befores and afters.
My main worry before buying the bag was that it might be so narrow that I would end up having to stack my stuff which I find inconvenient. Well, the bag is indeed very narrow, but it is tall enough for vertical orientation of contents, so there's not too many layers to The Stack and quite a few options for your Tetris game. Here's a WIMB, the blue glasses case goes on top. This is everything I typically carry, and I could still add a foldable nylon tote or something. However, the same exact things also fit in the Convertible Clutch or the Manor (the latter with room to spare) where they are a little more easily accessible. This makes the bag not ideal for running the kind of errands where you constantly have to be in and out of your purse.
I love the look of it though, and the security of the buckle closure. If the bag were a quarter inch deeper and had an outside slip pocket, it would be my HG.