I've field tested my laptop bag for a while now. I've taken it to events, loaded with laptop and other essentials, and gotten through airports without too much fuss, and I'm still really happy with it. Since I initially wrote about the laptop bag, we sold quite a few of them, and I'm happy to say that they are back in stock on DarkThreads.com.
Here is an interesting article about useful things to keep in your laptop bag:
The gear and tactics from Lifehackers laptop bags