Abstract: The invention relates to inner covering for containers, the objective of which is to reduce the impact of temperatures on the inside thereof and to protect against the moisture known as “container rain”. The covering is formed by a rectangular prismatic case (1) in the horizontal position, made from a laminated composite having several layers, with two smaller bases and a series of bars (4) arranged in fixing elements (3) corresponding to two or more edges of the smaller bases, characterized in that the bars (4) are formed by elements that can be inserted into one another.