Here's my Tom Bihn layout for a NYC conference. I have a Ristretto for my 13" Air, but I actually prefer the horizontal layout of the Imago. I put my Air into a Cache, which I can remove from the bag and carry around the conference.
Of course, packing cube and organizer pouches, all of which go into the Aeronaut. I'm getting to the age, however, where I may have to leave the Tom Bihn fold and get a rolling bag. I do wish Tom would do something for us traveling senior citizens.