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https://coldchain3pl.com/ There are two primary types of cold shipping: active and passive. Active cold shipping requires the use of mechanical cooling and is best suited for longer distances or when the external temperature is above that of the optimum range. Active cold shipping includes refrigerated trucks, railcars, and vessels. Passive cold shipping, on the other hand, relies on insulation, dry ice, or gel packs to maintain the desired temperature range. Passive cold shipping methods are more suitable for shorter trips or when the external temperature is lower than that of the optimum range. Passive cold shipping options include insulated shipping containers, coolers, and thermo boxes.