I travel for one week every month and over the years I've done considerable optimization to my travel pack. My last pack was the North Face Overhaul 40 and I thought it was quite nice. As I reduced what I carry to the essentials, I found that I wanted a smaller pack. The Osprey Quasar is perfect for what I need.

I actually appreciate that it doesn't have as many separate pockets as the Overhaul. For instance, instead of having the separate dirty clothing pouch that the Overhaul had, I just bought an Osprey dry sack and use it when necessary. It is more flexible and lighter than the extra pouch and zippers.

The Osprey Quasar pack will probably fit under almost all airplane seats, if you use it as a carry on.