What the perforation is for
Air moves through the load from every side and from underneath. That matters for produce that respires or sheds field heat, for anything washed and left to drain, and anywhere a load would sweat inside a closed box.
It costs nothing structurally. Every rating is identical to the closed RC-141, and the perforation takes 4.41 lb off each build.
The trade is the obvious one: fines, powders and small loose parts will escape. If that is your load, take the closed RC-141.









