I have an Aeronaut, Brain Bag, and recently ordered the Tristar and Empire Builder. I also bought my wife the large cafe bag several months ago which she loves. While I love them all, I have to say my favorite is the Brain Bag. It is the perfect backpack. Lots of organization (especially with a Freudian Slip) and it can easily shrink down in size with the side compression straps. It is the perfect bag for me - great for work and play.