Powerful LITTLE Pack
This is an awesome bag but I don't know why these guys are hollering "super roomy" in the description. It's not. It's an 18L. It's a small bag but it's fantastic for what it is. I used it for 4 years, then someone finally snagged it south of the border. The only real signs of wear and tear on this thing was with the velcro getting weak on the front flap. I put this thing through hell and the durability is there. There's no water bottle compartment so your Nalgene, if that's what you're rockin, will take up a big chunk of the space. Also, keep in mind the laptop compartment goes all the to the bottom skin of the bag. No padding or anything so set her down easy. I used the heck out of all the straps, loops, bells, and whistles. Climbing gear, days hikes, and what not. For the size, this bag the bomb.
Perfect All in One bag for work and adventurous travel
I actually bought this bag used from a friend, and I am in love. Switching from a minimalist, ultralight 28L from Walmart to this was quite the upgrade. It has thick pads on the back for comfort while providing channels for air, as well as some great zipper features that allow you to access the main compartment from the back of the bag. Fits all that I need for a carry-on weekend trip if I pack tightly, but works great for taking to work or on an overnight trip.