I love this bag, I use it all the time! I can fit my 13" Macbook and two or three decent sized textbooks when I am heading to campus, or a couple changes of clothes and essentials when I take a quick weekend trip to the coast or the city, or I can load it up with some snacks, sandwiches and a few beers for quick day hikes. The backdraft system is great and the straps are actually really comfortable for as thin as they appear to be, I really like the way the way the backdraft system separates my back from the pack, so I don't feel my load poking me in the spine when I don't take the time to balance my pack. I also carry this pack a lot when I am cycling around town, fits snug and doesn't shift around.
My only complaint would be the pockets on the hip belt, they are placed too far back on the belt for quick/easy access, and I also have trouble getting them to open and close properly with one hand. Other than that I completely love this pack!