A medical access port (10) has a base (12) and a lid (14). The base (12) has an adhesivelayer (26) which may be exposed by pulling a peel layer (28). The port may be thenstuck onto a bag (54) and an access aperture (34) may be enlarged, if desired, bycutting through a mounting substrate of the port (10) and a substrate (58) of thebag. The lid (14) may be opened and closed as desired and the access port may be locatedin the most suitable configuration for the particular use application concerned.