The total volume of the low profile T175 flask is 550ml, while the total volume of the high profile T175 flask is 650 ml. The high profile is available as a TC treated flask or a suspension (non-treated) flask. The low profile is only available TC treated. The growth (surface) area is the same for both: 182cm². However, the sides of the flask (when lying flat) are taller on the high profile than on the low profile flask. Therefore, the high profile suspension flask allows for a greater volume of media.