Abstract: Top structure for a transport compartment formed of a pallet with a so-called pallet collar or the like or of another upwardly openable container, which structure is adapted to upwardly close the compartment and to maintain cold in the goods contained in the transport compartment. The new feature is that a tank or container for cooling or freezing medium in liquid state is accommodated in the top structure, said tank being provided with a permanently open nozzle through which the medium after evaporation is adapted successively to flow out into the compartment under the top structure.