If you want, you can have a coffin made out of cardboard or...

If you want, you can have a coffin made out of cardboard or wicker or papier mache. There's one like a seed pod, or you could buy one that doubles as both a bookcase and a coffin. During your life, you stand it in your living room, and then after you die, the books are taken out and your body put in their place and the whole thing buried.