I've been using this backpack every day for a couple months now, and i can honestly say it is my favorite backpack out of every different option I've tried over the years. It's slim enough that I don't feel like a bulldozer on the subway, generally small enough that my 5' frame isn't overwhelmed, but big enough to fit everything I need for work - including my 13" macbook air. The look is clean and professional enough for my office setting, but casual enough that I can use it anywhere. I'm pretty rough on my belongings, and it's holding up very well. I spilled coffee all over it, and there are no stains (green color holds up extremely well). There is a pocket for absolutlely everything I want to have on me - pens, phone, headphones, etc. It keeps me organized and I'm never rooting around in the bottom of my bag for things. Two expandable drink holders are excellent - they've fit my tall Klean Kanteen and every other thermos I've tried. Because there are two you can carry both coffee and water, which is GREAT. All around very pleased and would purchase again.
My only complaint is that the sunglasses pocket is very small, so my glasses stick out significantly. Other than that, fantastic product. Highly recommend.