Key Takeaway
Box dimensions are read and measured in length x width x height: at the opening, call the longer side length and the shorter side width, then measure height from the opening to the base. Use inside dimensions when fitting a product or ordering custom packaging. For shipping, measure the outside at its widest points after packing, including bulges, and round as the carrier instructs. A shipper's size affects dimensional weight, so calculate length x width x height and compare dimensional weight with actual scale weight. Leaving only enough clearance for protective material avoids both crushing and unnecessary shipping volume.
