I was hoping someone could give me a recommendation on the ID vs the Empire Builder. I have an Aeronaut and a Brain Bag, but was looking for something a bit smaller than the Brain Bag as a personal item for flights (as I will be using the Aeronaut as my carry-on). Most of this travel will be for business and I will be carrying my labtop with me and other small devices (point and shoot camera, cell phone, etc...). I would plan to use this bag to take to professional meetings when I travel as well. Any comparisons would be helpful.