Why do I always seem to have moisture on the CoolPacs?
If using a frozen CoolPac within a control temperature package, it is often noted that at the end of the shipping process there may be some moisture on the CoolPacs. This moisture is simply condensation that has occurred due to the warmer air within the system, coming into contact with the colder surface of the CoolPac and so some of the water vapour contained within the warm air has been released as the air temperature falls.