Ignore this advice!
I just got back from my first trip out with it and it is a lousy camera bag. It is too tight, the 5D barely fits, which is ok on the sofa but not on the street. And the very first time I opened it I unzipped it past the body and it almost fell out to the ground!
Hmmmm, I've been reading this page pretty much daily since I found it a few weeks ago. I'm not traveling but I know I miss shots because I don't have my gear with me. I looked into the 4/3rds and cameras like the GI X but either they are too large to be pocketable or the quality isn't there yet.
So I decided to not buy a small camera and just carry part of my gear with me.
Now I did't want it looking like a camera bag, I didn't want it looking like a man-purse either. And it had to hold a bigger DSRL and a gorilla-pod SLR. So small is out!
There just isn't anything out there it seems so I went basement diving and found my old Camelbak MULE, or I think the spelled it M.U.L.E. It is a hydration backpack designed for cyclist. I had put it in the basement because it was just too small for hiking. (Great for cycling though!)
In this shot it is holding the Canon 5D MkII, the 17-40mm f4.0 and the large gorilla-pod SLR in the front pocket. You can see the camera bulging through the top. It is a tight fit for sure, a smaller DSLR will work.
So, not the perfect bag for traveling, but for knocking about town, I think it will be my bag. I just "discovered" this today so I've yet to use it. Hope it works...