For something completely different...I use a J.Crew messenger bag as an everyday commuter bag, in conjunction with the Timbuk2 small size camera insert. In profile, it's similar to a Hadley Pro, but it's a larger bag. I am able to fit the following in the bag:
1. 5DIII with lens attached (usually 50mm 1.2L, but will also fit larger lenses. I've even been able to fit it with a 70-200 2.8 lens up in a pinch.)
2. 2 extra lenses—70-200 2.8 with hood reversed, plus one other large-ish lens like an 85 1.2
3. 15" MacbookPro + power adapter
5. Assorted other small things like Black Rapid strap, batteries, etc.
6. iPad in external pocket
It's heavy fully loaded, but I seldom load it up like this. The current J.Crew bag is slightly different looking, but appears to be the same design as the one I have. They actually look like they've made one or two improvements...for one thing, the current version has a wider looking strap and comes with a pad. Mine was narrower and I use my Billy pad on it. Here's a link: http://www.jcrew.com …gs/PRDOVR~51657/51657.jsp
And here's a link to the Timbuk2 insert: http://www.timbuk2.com …oop-camera-insert/1997729
For under $150, I'm pretty happy with this as a daily beater bag.