Atmos Sub-Vers Mini features the same innovative air-flow system as the regular sub-vers tank system but in a much more compact environment. The bottom openning of the air path allows cold air comes in and heats through the walls of the tank in a 0.7 inch diameter total. Atmos Sub-vers Mini also features the similar stainless steel and pyrex glass component as the housing. The tank capacity of Atmos Sub-Vers Mini is 2 ML compared to the 4.5ML of the original sub-vers. The dual adjustable air flow system allows user to control the vapor output.