A Gravity Pack is an advanced piece of technology which was surprisingly created by the krogan of the Tuchanka State Union, more specifically, the Tuchanka Center of Science & Technology. It is a machine developed from reverse-engineered Collector technology which exploits element zero to create a bubble of gravity. They are usually integrated into armor and controlled through a remote cerebral implant in the wearer's brain. Unlike most mass effect drives, the Gravity Pack gives the user considerable maneuverability and freedom.