The idea of this is to put waste in here, and expose it to the sun's radiation (or, if in oxygen possibly bacteria, depending on the environment it is in), and let it slowly be degraded. Of course, that is not the only thing it could be used for, the imagination is your limit with this one. The 5 cubed has two "levels", each with a small hole for inserting (or removing) objects. This would be printed with a clear material, which would allow for more radiation to enter. The 5 cubed is 5.5 inches cubed, but the usable volume is somewhere around 5 inches, due to the half inch thick walls.