A plastic bag (10) made of plastic film (20) with one or more ports (30). At least one of these ports (30) has a plastic element (40) that is welded between two layers of plastic film (22, 24), thereby forming a port-welding region (50). The plastic element (40) can be pressed flat in the port-welding region (50). The section of the unstressed plastic element (40) when not compressed forms a wedge shape directed towards the side edges of the port-welding region (50). The plastic element (40) has at least one first edge (80) in the port-welding area (50). The plastic bag (10) enables an optional manufacturing method which is especially applicable in the medical sector.
