The Dragon capsule can transport of cargo, which can be all pressurized, all unpressurized, or a combination thereof. It can return to Earth , which can be all unpressurized disposal mass, or up to of return pressurized cargo, driven by parachute limitations. There is a volume constraint of trunk unpressurized cargo and of pressurized cargo (up or down). The trunk was first used operationally on the Dragon's CRS-2 mission in March 2013. Its solar arrays produce a peak power of 4 kW.