The HD corrugated cardboard files boxes are stable and strong. They stack well.Even though there is not a rail you can hang files. The files will not slide but I think a layer of packing tape to smooth the edge will do it. I ordered the heavy duty file boxes because I had the tru red plastic file boxes by IRIS and the plastic was still gassing off after a month. My lungs and face were burning from it. The IRIS boxes are not water proof because there is a hole to put the sliders on therefore the HD file boxes are the best choice.