If you want the shortest -- go with a Provari mini. (18350)
Next in height is the Evic at about 1/4 inch taller. (18350)
(Edit--original version only. The Supreme is much taller.) (the USB charging is a nice asset, imho)
The Sigilei Zmax (18350) is the same height as Provari mini with extention cap, or Provari standard, that give more
vaping time, using 18500
batteries.
Kayfun looks great on Provari's with a beauty ring and pretty fine with the Evic. (I prefer the flat cap). I'm disappointed with the gap on the Sigilei Zmax, but I have an older version mini. Perhaps that has been changed.