Dimensions are always given in the sequence of length,
width, and depth (LxWxD). Length is always the larger of the two dimensions of the open face of a box
as it is set up for filling. Width is the smaller dimension of the open face. Depth is the
distance perpendicular to the length and width.
End-opening boxes are measured as though they were top-opening.
Folders are measured in the same way as boxes, with the length being the
larger of the two dimensions of the open face, and width the smaller.