I reccommend an Echo E kit from vape 2 Live. This is a two piece ego 510 type ecig with the atty/cart as one piece. Holds 2.5mls of juice and the battery is 1300 mah which last for 2 to 3 days. Decent throat hit and vapor. It does mute the taste of juices a bit (lots of coiled polyfill batting) but is the best for as convience and symplicity.