A method for contamination-free docking of a first at least partially flexible receptacle to a second at least partially flexible receptacle. The receptacles include, at least in part, films having outer sides that can be solidly welded, and inner sides can be detachably welded. According to the described system, a solid connection between the receptacles is produced outside the detachably welded inner sides in order to create a channel between the receptacles. The channel is opened by loosening the connection between the inner sides.