Most Light Industrial Shelving is either 36 or 48 inches long by 12, 18 or 24 inches deep. We use primarily 36 long x 18 inch deep shelving and these are the ONLY storage boxes that maximize the use of these shelves as 3 storage boxes fit perfectly on each shelf. These boxes are tapered so they nest together when empty; I would prefer that they weren't tapered they then make even better use of the space. I would also like to see hinged lids as well; when you have to remove the lid, you have to have somewhere to put which takes up valuable bench top real estate.