This is Ona's bag called The Bowery.
I recently decided that I'd like to have a shoulder bag that's big enough to carry 2 camera bodies so I don't have to decide between film or digital when I'm headed out the door. I already have a sling bag from Lowepro, but it's better suited to hiking or dedicated photo expeditions. I also have a couple small bags that fit any one of my different camera bodies and an extra lens, but nothing else.
I'll post a review after I've spent more time with it, but so far I like it.