The present invention provides a container, comprising: a cavity provided with a first opening portion; a pressure buffer area which is positioned above the cavity and the first opening portion and which is provided with a second opening portion corresponding to the first opening portion; and a thin film channel which extends through the first opening portion and the second opening portion and which has an inner channel wall and an outer channel wall, wherein the inner channel wall forms a passage for fluids with an inlet end and an outlet end, the inlet end being positioned outside the second opening portion of the pressure buffer area with a first opening and closing structure and the outlet end being positioned inside the cavity, and wherein the second opening portion is hermetically connected to the outer channel wall while the first opening portion is hermetically connected to the outer channel wall except for the area of at least one directing hole formed therebetween, such that a fluid under pressure flows back to the pressure buffer area through the directing hole.