I can understand having 3 tanks.
I see some people look like they have more than a dozen or what seems to me more than they could possible use.
Why so many tanks?
It's a hobby for most I would think. For me it is about function, fit, looks, flavor, capacity, ease of use, ease of cleaning, tinker factor, hands on factor, portability and finally ruggedness. The more tanks you have ready to go at one time the easier it is to swap out and change to a different juice/flavor without dumping juice, cleaning, drying and or re-wicking/coiling. My more costly and better looking as well as better performing items stay at home while the rugged ones get to go out with me. They usually cost less so if something happens to them it is not a big loss.
Like this... My VAMO, AGA-T2 and Kanger ProTank will stay at home while my Vision Spinners and Vision vivi novas, Kanger MT3's, EVOD's and carto tanks will all hit the road. The EVOD is a great mix of performance and ruggedness however I think the ProTank would do fine on the road... but it looks to good and I don't want to mar its finish. Ya follow?