Way cool, I’m having one of these instead of a straight cardboard job. (See text below for allegedly morbid reference.)
Did you know that many coffins are made of chipboard overlaid in veneer. Chipboard decays slowly, releasing harmful gasses into the environment – quite aside from all of the things in its manufacture.
Of course, you could seal my body inside a glass case, together with some sort of plant and some bacteria/ insect / pet cat, and see if it comes up with a whole new ecosystem.