The Eleaf GS Drive Tank is one of the very first GS tanks to use a sliding top fill, giving it that edge over its competitors. Not only is the Eleaf GS Drive Tank a perfect match for many of the e cig battery varieties but it comes with a customizable bottom airflow. At first touch, you will know that this tank is made of some quality stuff thanks to its thick glass and metal construction. In addition to that, every inhale will feel like a million dollars with this lovely Eleaf piece. If you like to vape on a regular e cig style device, then give this tank a go and see for yourself what all the others are saying.