Clear wedge shaped boxes for retailing sandwiches.
The dimensions shown are shown in mm only because there is only 5mm difference in the depth of the two different boxes, which is not really expressible in inches.
The boxes are triangular, to take the two pices of a diagonally halved sandwich, with the first 2 dimensions being the maximum size of the half-sandwich pieces, and the third dimension being the depth of the two stacked half-sandwich pieces the box can take.