The BLACK JACK is also a completely new design. It is developed from the Ace but incorporates PAC (Pressure Activated and Controlled) Valves. The advantage of PAC Valves over a simple vent is that none of the canopy’s performance, stability or responsiveness is lost to the unavoidable out-flow of air. Additionally, the PAC Valves have allowed us to actually set the rate of pressurization , making the canopy useful on longer delays as well as ultra short delays. The Black Jack is intended for the low altitude jumper looking for an advantage in versatility and safety without compromising landings or in flight performance.