Since Guyon is so motivated about his Camelbak, I will share some of my Camelbaks. Camelbak makes great stuff. Rugged and well built, they outperform (IMO) most of the other high-end gear manufacturer's stuff. And, too be frank, a Camelbak won't scare the crap out of the hippies in public places.
A Camelbak "Mule" I use A LOT, in town as well as out in the wilderness.
A Camelbak "Something or other" that I picked up right before I deployed in 2009. I used it all over Afghanistan and it is still in great shape. I carry it now whenever we go camping. It is massive and can hold just about anything you can think of. Love this thing!
OK, so I love Camelbak but I will concede that 5.11 makes good stuff too, but sometimes the 5.11 stuff makes me shy away from it. However, my wife got me this 5.11 "Messenger Bag" that I use when I'm going to work. It carries my laptop as well as important papers and even my lunch. It's fast becoming my favorite city pack.