Has anyone else tried this?
I bought the largest size Kangzhu (the jumbo pair specifically for breast enlargement) and needed a pump for them, so bought their twelve piece Kangzhu cupping set that comes with a pump (set costs about the same as the pump alone on Amazon).
Since I have them, I tried putting the largest ones from the small set on, pumped, and then put the jumbo Large on over them, pumped. So the double Kangzhu!
I don't keep them on long, just do a bit more than enough suction to keep everything on, and swear things point a little more straight ahead than just hanging.
Will experiment a bit more.