Well then to stir the pot a little more......
I sometimes carry the S19 in the TriStar either with or without computers in it especially when I drive one way and fly the other on a trip.
During the summer I do this several times as I deliver and then retrieve cars for people around the country.
I like to 1-Bag too when flying but then I buy food and stuff before driving and it is nice to have a second bag for the extra stuff.
I also will fly sometimes and ship tools to myself and having a second bag is great to make a smaller sunset of the tools more portable once I am at the job which often will involve a lot of shlepping around and where the whole load of tools would be too much work.
Anyway an S19 is not that pretty inside a TriStar but it does get the job done and I can also carry it both in one of the 3 standard spots in the TriStar or in the compartment where the straps stow when stowed,it is a huge space that I use all the time.
I don't have an Aeronaut but I do have a Patagonia bag designed just like it but larger and I have yet to find a way I love to carry computers in it along with my other stuff.
I always end up carrying the Empire Builder or Super Ego too for the tech so I just can't say I have figured this one out yet without my TriStar!
There are good reasons it sits at the top of the Bihn food chain I think!