My much needed new messenger bag arrived this morning after ordering it at 1am from the Rain Forest on Thursday.
I'm extremely impressed by it's quality, and it holds the rMBP perfectly, without it moving about. Something I was kind of worried about. Lots of extra pouches on the inside and lots of space. It can hold two external passport HDD's, an iPad, the laptop of course and still has room for books and some pouches for pens and markers.
Another zipped pouch on the front under the main flap, and an open pouch on the back, with another hdd size pouch. they show it holding an iPhone though. Not that I'd put it in there.