Here is the best way to communicate your box dimensions for printing purposes. It's as easy as 1-2-3.
Simple Steps to Measure Your Box
Length x Width x Depth
Open the box top first then measure the LENGTH. It is the largest of the two dimensions on the open end.
Now measure the WIDTH, which is the smallest dimension on the open end.
Next, is the DEPTH, which is the measurement between two ends of the box.