To easily confirm the contents or the remaining volume thereof, by forming an aperture with an appropriate size and shape such as rectangle, circle, or ellipse at an appropriate face of a paper container and sticking inflammable transparent paper.

The body 1 is made of cardboard or the like. A punched part or an aperture 2 having an appropriate size is formed at an appropriate part of the body. And an inflammable transparent paper which withstands the pressure of the contents in the body and has such a strength that any damage does not bring on transporting it, is stuck on the aperture 2. In this way, the contents and the remaining volume thereof can be easily confirmed. And as it is inflammable, there is no disposal problem.