The shipper utilizes a modular design like the other options, helping users save money and time, and reduce their carbon footprint. For example, a client can implement a fleet of 36-liter containers and utilize a mix of thermal regulating units in any of the three temperature ranges. This makes pack out easy. Packers simply place their cargo in the payload, drop the temperature-charged thermal regulating unit onto the base of the shipper, close the unit and it is ready for shipping.