During the night, the container itself can begin to sweat. As in the previous example, this occurs when there is air remaining in the container, and there is a temperature change. When the sun goes down, the temperature of the container panels drops more quickly than the interior air, whose humidity condenses as drops of water on the interior of the roof, which has become relatively cool.

If these drops accumulate, they will begin to fall on the cargo below. Different shipping routes have marked changes of temperature (especially in winter), requiring shippers to take the following precautions:

1. Products with high moisture content should not be put in the same container as those prone to moisture damage. If this is unavoidable, the two types of products must be separated and protected from each other.
   
   
2. Packing material must be dry, and wooden strips, pallets, etc. should be made from dry wood.
   
   
3. Risk of damage from condensation and fungi can be reduced by stowing products to allow adequate air circulation. This can be done by using separating material (dunnage, etc.) or by stowing the cargo in stacks separated by air spaces.
   
   
4. Condensation can be reduced by absorbing agents (eg. silica gel). The quantity and distribution of this material in the container should be calculated according to each specific product.
   
   
5. When loading a product that might produce condensation, it must be covered with paper or other absorbent material. This will prevent falling drops of condensation from landing on the product. Don't use plastic sheets for this purpose. Dunnage placed under the cargo and against the walls of the container also helps reduce damage from condensation.
   
   
6. To further reduce risk of condensation, CSAV vessels holds are amply ventilated. The air in these holds can be kept at the same temperature as the interior air of the container, helping to eliminate temperature differences that can cause sweating.