The invention concerns a port system (1) for fastening a container (3) comprising a vessel (2) and an outlet (6) to a connection system (14) presenting an inlet, said port system comprising: —a main skirt (4) connectable to the outlet (6) of the container presenting a connecting end and a discharge end (7), —a hopper (8) attached to the internal wall of the skirt and tapering to a discharge outlet (9) in direction of the main skirt discharge end (7), —a tearable membrane (10) closing the skirt discharge end and the hopper.