The herakles plus tank is an upgrade version of herakles sub-ohm tank.It features top and bottom airflow holes for intesified flavor and larger clouds.It also features new coils design,reengineered airflow system, and convenient top-fill capability. Sense has designed an inner and outer chamber, corresponding to the traditional bottom airflow and the newly designed top airflow respectively, so that each airflow system contributed directly to the workings of the Herakles Plus. Also, an improved top-fill method is an added ergonomic factor, providing convenient refills and significantly solve leaking problems.