Cold Chain Technologies' KoolTemp Express GTS-18 is a prequalified 2°-8°C lightweight shipper ideal for shipping next-day deliverable unit doses. Its design features excellent thermal characteristics, achieved through the use and placement of its Koolit (PCM) +5°C saddle- bags and Koolit refrigerant bricks. The KoolTemp Express GTS-18 is shipped and stored knocked-down to save space, but assembles in seconds.