Provided is a fastening assembly and a container system containing the same. The fastening assembly includes a cylindrical neck member, including a series of convolutions axially extending around at least a portion of the external surface of the neck member and forming an interrupted helical thread of incomplete formation; a collar member configured for screw fastening with the neck member, including at least one rib configured for thread-engagement with the helical thread, the at least one rib forming a portion of an internal thread.