The invention relates to a suction bag assembly for collection of liquid fluid, the assembly comprising a collection container (1) open at its one end, a cover (4) for closing the open end of the collection container (1), a flexible suction bag (3) which is adapted insertable into the collection container (1) so as to be attached to said cover (4), a connector (2) adapted to the collection container (1) and communicating via a flow channel with a vacuum source so as to provide a vacuum between the interior surface of the collection container (1) and the exterior surface of the suction bag (3), a patient tubing connector (5) serving to provide fluid communications from the source of fluids being sucked to the interior of the suction bag (3), a conduit (7) adapted to the cover (4) for transmitting the applied vacuum to the interior of the suction bag (3), and a filter (6) adapted to the end of the conduit (7) exiting into the interior of the suction bag (3), whereby the filter serves to prevent contaminants from entering the vacuum system.
