What do box dimensions refer to?

Are you inputting your dimensions for a custom corrugated shipping box? If so, you might be confused - what is the height, width, length?

Box dimensions always refer to measurements INSIDE of the box (as opposed to the outside / exterior of the box). You will list the dimensions in inches according to Length x Width x Height. 

The length is typically the larger dimension of the open face/flap opening, and the width is typically the smaller. For example, the length on a Tab Lock box is the horizontal edge with the opening facing you. The height is perpendicular to the length and width, or how tall the box is.

We know it can be confusing to understand what side of a box each dimension is referring to. The following visuals can help clarify!

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