Rong / life thing

he paper used has the ability to kill germ and prevent permeation.
Its total surface area is the ? or even 1/3 of that of the normal tissue, can effectively save two or more units of resources.
The external shape is designed to look like a stair-case, the upper end of the each layer of paper has a sticker, used to seal the paper after use.
There is a piece of PVC on the external paper to prevent leak of the liquid to wet the papers which will subsequently spoil the un-used papers.