Consisting of 2 sheets of flat paper sandwiched together with 1 sheet of corrugated paper, with the corrugated sheet being in the middle between the 2 sheets of flat paper. This feature is suitable for products of medium weight that do not require much emphasis on strength. Used as inner packaging for Inner Box. Standard corrugations: A, B, C, E, and G, as shown in the illustration below. There are 5 types: A, C, B, E, and G.

Consisting of 2 sheets of flat paper sandwiched together with 1 sheet of corrugated paper, with the corrugated sheet being in the middle between the 2 sheets of flat paper. This feature is suitable for products of medium weight that do not require much emphasis on strength. Used as inner packaging for Inner Box. Standard corrugations: A, B, C, E, and G, as shown in the illustration below. There are 5 types: A, C, B, E, and G.