Abstract: A one-piece closure includes first and second closure portions. The first closure portion includes a first polymeric top wall portion and a first polymeric annular skirt portion depending from the first polymeric top wall portion. The first polymeric top wall portion includes a continuous wedge seal extending from an inner surface of the first polymeric top wall portion. The continuous wedge seal includes a surface-tension geometric structure being located therein to assist in preventing or inhibiting contents of a container from leaving the one-piece closure when the first closure portion is in an open position. The second closure portion includes a second polymeric top wall portion and a second polymeric annular skirt portion depending from the second polymeric top wall portion. The one-piece closure is adapted to be opened by flipping the first closure portion with respect to the second closure portion via a hinge or pivot point.

Abstract: A package includes a container and a one-piece closure. The container has a neck portion defining an opening, an external helical thread formation and ratchet catch lugs. The closure fits to the neck portion of the container for closing the opening. The closure includes a first and a second closure portion. The closure includes a top wall portion and an annular skirt portion. The annular skirt portion includes an internal helical thread formation for mating engagement with the external helical thread formation. An interior surface of the annular skirt portion includes helical ratchet teeth threads. At least one of the ratchet catch lugs mechanically catches and locks with a respective one of the helical ratchet teeth threads so as to prevent or inhibit the closure from being removed from the container. The closure opens by flipping via a hinge.