This might be a little different than what you're looking for, but I'll recommend it since I've been really happy with it since I got it.
I got a Tom Bihn Smart Alec backpack:
http://www.tombihn.com/page/001/PROD/100/TB0103
Combined with a Tom Bihn Vertical Brain Cell:
http://www.tombihn.com/page/001/PROD/300/TB0390
The backpack itself is really high quality, with plenty of room for books and I really like the way that it opens up at the top and has all of your pockets instantly accessible.
The really cool thing is that the Vertical Brain Cell laptop bag itself can clip into the Smart Alec, so you can use it as a laptop bag, or take the brain cell out and use it by itself (and use the backpack by itself if you don't need to take your laptop along).
The Brain Cell especially provides absolutely amazing protection.......... hard protection on all sides, and the top of it velcros shut like a cereal box, so it is really easy to take the MBP out.
I previously had a SwissGear Maxxum backpack, which was fine, but I was never that confident in the section of it for putting your laptop in it.
I really like this combination because i feel completely confident in the protection of my MBP between the Smart Alec backpack itself and the Vertical Brain Cell.
EDIT: Correction, the flaps at the top use something called Applix, not velcro:
The Vertical Brain Cell, like the Horizontal Brain Cell, provides superior protection for your laptop. Your laptop hangs suspended, cradled in 8mm thick soft foam padding in a 4mm hard corrugated plastic insert that protects from the front, back, and bottom. The sides are protected by dense cross-linked closed-cell polyethylene foam. This offers the toughest protection you can get for your laptop in a case that is still light and minimalist. It closes on the top, like a cereal box, with two padded flaps that seal with Aplix® strips (like Velcro®, only longer-lasting.) Your laptop will be protected from every angle.