Any eGo or 510 tank will fit perfect. I have Protanks, iClear 30's, and clearomizers and all work good. I have found that the eGo ring that comes with the protank cuts down on the airy draw of the protank. The ring that comes with the itaste seems to only be good at holding carto tanks ( the really big fat ones ). I use my 1000mah eGo's clearomizers/ BCC's for on the go/work. I use my itaste at home around the computer ( does not roll off ) and my Vamo when I want that high power vape ( at home only ).