The whole unit was built into a can with a diameter no larger than 6 inches (150 mm) and weighed just over 300 pounds (140 kg) so it could be handled by machinery scaled up from a soft-drink vending machine; Coca-Cola was consulted on the design.[40]
https://en.wikipedia.org/wiki/Project_Orion_(nuclear_propulsion)
The whole unit was built into a can with a diameter no larger than 6 inches (150 mm) and weighed just over 300 pounds (140 kg) so it could be handled by machinery scaled up from a soft-drink vending machine; Coca-Cola was consulted on the design.[40]