Abstract: A vacuum canister comprises a container section and a cover with an integrally formed air suction device. The air suction device includes a sleeve pipe, an eduction membrane and a piston tube. One end of the sleeve pipe has an anchor plate and a grating plate. A flexible eduction membrane is located between the anchor plate and the grating plate, and fastened to the anchor plate. The anchor plate has a flow hole therethrough and the grating plate has an air hole therethrough. The membrane is movable between a first position in which the membrane allows airflow through the air hole and a second position in which the membrane blocks airflow through the air hole. The piston tube is received by, and moves within, the sleeve pipe. One end of the piston tube has a front retaining edge, a rear retaining edge, and a flexible O-ring movable therebetween. The front and rear retaining ends are separated by an interval of space. The O-ring has a thickness smaller than the interval of space.