Images above represent how to measure top loading, end loading, and side loading.
Dimensions are given in sequence of the LENGTH (LENGTH = HEIGHT), WIDTH & DEPTH.
An easy way to remember how a box is measured is to think of Length as left to right, the Width as chest out, and Depth as looking down into the bottom of the box.
Dimensions are described based on the box opening, which can be the Top, Side, or End, depending on how it is filled. The longer two sides of a box are considered the Length, whereas the shorter sides are considered the Width.
To ensure an accurate-fitting box, all measurements must be taken from the inside of the box.
Common Box structures:
Information and illustrations used with permission from the Fibre Box Association. Fibre Box Handbook is copyright ©2005 Fibre Box Association. All rights reserved. www.fibrebox.org