large organizer fits, sort of
i use the large organizer with my imago. the large organizer sticks out of the back pocket by about 2 inches or so; also, it's a bit folded and not flat in the back pocket. it will firmly in the back pocket when used that way; i don't worry that it might slide out.
inside the imago, it is also bent in the long direction, not flat, but it can still hold folders well. at the top along the edge where it meets the top of the bag, it will also curve with the flap of the bag. i use it for carrying folders about an inch thick and my papers do not get wrinkled.
i have the steel/cork/wasabi combination and like it very much. i just happened to walk outside with it in a downpour today, and it stook up quite well to the rain, better than me and the jacket i was wearing! the cork looks the same when it's dry as before it got wet.
hope this helps!