Thanks. By the way, I don't know if it says on the site that the Ground bag not only has a pocket for a laptop, but comes with a second nylon sleeve for your laptop (I'm not exactly sure why, but it's a nice bonus for sure).
In any case, it doesn't look nearly as big in person as it looks in the picture -- like I said -- b/c in person it's not expanded out so much with normal usage.
The thing that attracted me to the Ground pack is that it's designed so well. It has a place for my headphones to come out of the MP3 player pocket, it has a laptop pouch, has tons of little pockets for whatever my little heart wants to carry. And its interior is made of light colored nylon so you can see loose items in your bag (like a pen cap).
But what I like best is the way it distributes weight and fits on my back. I could actually carry a laptop and several casebooks without a problem. The weight is less distributed in the lower back than most bags, and that helps.