Cargo drones are 650 millimeter-sized hexacopters with huge propellers that are extremely efficient. Before the outbreak, they were the industry standard for delivery services like Amazon, UPS and DHL. They fly high and slowly, and are powered by super efficient solar cells. They are used to move multiple items simultaneously, as well as to move heavy items. Because they fly at higher altitudes, they are much more difficult to catch. After the outbreak, Sky Medix began using cargo drones to transport arc pellets from the hidden stores to the various drone hubs.