My last bike was a 2010 650 ABS V-Strom with 45L Givi Topbox and 45L and 35L panniers. I also had a seat bag and boy, could you get some stuff on that bike. Did I mention the tank bag? Tank capacity is "only" 22 L, but I used to get between 4.0 and 4.3 L/100 Km, so the range was comparable to the ST. I also fitted "Bar-backs" and a tall Givi screen with Madstad adjustable brackets, along with an AirHawk cushion and it was good for touring all day long.
The main difference is the amount of "punch" the 100 and 1300's have, but if you are touring, who needs so much punch?
There are many, many roads that were part of my regular rides when I had the Suzie that are no longer on the agenda now that I have the Honda. I sold the Suzie to somebody about to do a circumnavigation. I miss her.