In all my trips with the Tristar or the A45, my personal item has been my S19.

Except the last two trips, it was the LSB.

Pro: the LSB allow to bring more stuff.

Domestic U.S airline with a short line at the departure airport, not a problem.

Con: airports with long lines

moving around while sightseeing

A third solution is to pack the S19 and fit it inside the LSB then pack the LSB inside the S19 while sightseeing.

Everything fits in the S19 but the FJN, when I have to pack it in a hurry.

I could try to travel without it, but I don't like it.