I have both the Kanger ST Nano and the Nauti Mini. They're about the same size for me. The full-sized Nauti is pretty huge - as is the STM, IMO. I shied away from the Kanger PT2s when I started vaping last year because THEY seemed so huge - however, they're no bigger than the Nano or the Nauti Mini. I almost never use my EVOD/Mini PT2 tanks - they're too SMALL!!!!!