How does the formula of carton come from Calculation formula (length + width + 5) x (width + height + 3), "+ 5, + 3" what do you mean?

This is the estimation formula of carton material. The correct formula should be (length + width + 5) x (width + height + 3) x 2. The unit of length, width and height is centimeter, and the unit of material area is square centimeter. Here + 5 is the length of reserved lap (joint) and + 3 is the width of reserved trimming. In addition, it is not necessarily + 5 + 3, or + 3 + 3 or + 8 + 4, depending on the specific situation

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