Tenba large messenger bag is my current favorite. I sold off all my other bags. It feels sturdy and light, costs less than others, holds all of my stuff.
I have found it wise to get a bag for a laptop one size larger than your laptop dimensions. Because once you start filling it up, items wind up taking their amount of space and can pull at the area dedicated for the laptop, making it a tighter fit than it normally would be. This held true for the Think Tank Urban Disguise 60 bag I used to have.
