The Foamcase has all of the patented external features of the Standard Porter Case, but on the inside we have removed the luggage case liner and added customizable foam for the traveler who has specific items that must be protected and carried. The interior consists of four layers of medium density gray foam 1?" thick on the bottom and a convoluted piece in the lid. By making outlines of the articles to be protected on the surface of the foam layers and using a craft knife or electric carving knife to remove the excess material, this case can be quickly customized to carry almost any specialty items that you need to protect. After your trip the patented cart feature is instantly there to help you carry up to 200 pounds of extra gear on top.