This upgraded shipping option ships strains in a ULINE insulated cooler box with a refrigerated cold pack. The increase in price covers the cost of the cooler box and cold pack, and the increase in shipping charges due to the larger-sized container and weight.

Please note that the use of the cold pack is meant to keep the temperature inside the larger container at a cooler temperature to better insulate it from temperature swings during transit. The cold pack is not meant to keep the strains cold or frozen, as they are placed in a smaller styrofoam box that is then placed inside the larger cooler with the cold pack. This is beneficial when shipping temperature-sensitive strains.