I have the xl. I keep my meter clamp on meter fluke 52 thermometer + 2 pipe clamp probes, my label printer plus all my hand tools in there with room to spare. But then agdon I work in markets so I use a shopping buggy to carry my tools around.
Just remember, you dint have to fill a large bag to capacity, but it's nice to have the room when you Need it.
I've had my Vito for about 8 months now, so far I think it's the best tool bag I've ever owned!!
Fwiw my apprentice has the lc he wishes he had bought the xl.