I have a lot of bags and packs. For me, i love Maxpedition for the pockets and organization. I use Maxped bags for EDC use. I have 3 with one coming. I like them for EDC because they allow me to keep all of my EDC stuff organized. You know, knives, FAKs, rain hat, light jacket, mints, computer cords, stamps, flashlights, pens, pencils, cell phone, iPod, etc.
That and they always have a place for CCW when I need it.
I have three sizes but all are for EDC use. I started with the Fatboy, but it's my least favorite one. I'm a big fan of the Gearslinger series.
I just ordered the Sitka because I wanted to a minimal bag for EDC that would still fit my MacBook. I have other great bigger laptop backpacks, but this is to be as small as I can make it and still have the essentials.
Check out the Gearslingers. There are a bunch, not sure which one to recommend, it depends on how much stuff you want to carry. If you're going to get something bigger than 1000 cubic inches you may as well get a backpack (rather than a Gearslinger). They handle the weight better than the one-sided Gearslingers.
The comment about Maxpeditions being tacticool is right on. I live and work in the city and for the most part people are so ignorant about 'tactical' that I don't worry about it. In black they aren't that bad. And I don't dress like a mall ninja so it doesn't really stick out. I also thing the one-sided gearslingers aren't very tactical looking in an urban enviroment. The backpacks have a much higher tactical 'factor' in comparison. They look really military even in an urban environment.