Abstract: Containment packages (10) having utility for transport of hazardous gases and security systems for controlling access to packages, e.g., hazardous gas containment packages (20). In a specific implementation, a containment package includes an overpack (11) for improving the safety and security of gas-containment vessels during transportation, e.g., air shipment, in which the overpack is pressurized by a protective gas at pressure in excess of the pressure in the gas-containment vessels, and a global positioning system (GPS) coordinated programmable lock and key system (30) is integrated with the containment package for controlled access to the gas-containment vessels only when the GPS component indicates that the containment package is at a specific geographic location.