I was looking at this bag for some time but decided against it as it's a pretty old bag. I'm guessing the size should be adequate for an M9 with attached lens and a NEX with attached lens.
That said, for a little more money, you could get a Billingham f1.4 which is deceptively spacious - I have an M9 with an attached 35 cron IV with hood, a Monochrom with attached 50 cron, and a Zeiss Ikon with attached 21 Super-Elmar and viewfinder with space remaining for memory cards, cleaning chamois, 2 spare M batteries, 1.25x and 1.4x magnifiers, and a few extra rolls of film. And fully loaded, it's about the size of a Lowepro Messenger. My only gripe with the f1.4 is the absence of a hand grip/strap on top, which is why I also picked up a Hadley Pro, which holds a similar amount of gear