My all day carto is an xl steel dual coil on an eGo. It fits the cone, holds a lot of juice and is a durable long lasting (a month w/thinner juices) carto for me. I want simplicity at work and out, and this thing requires no attention for hours at a time. I use a drip tip and it's easy to top it off with a dozen drops if I vape it heavy for a couple hours. If your needs are under 1 1/2 ml per day it goes all day, and never a leak. Good luck finding what works for you!