A closure system includes a container and a closure. The container including a rim extending perpendicular to the side wall, the rim including a locking lug extending from an upper surface of the rim and a break disposed in the rim adjacent to the locking tab, the break operable to form a deflectable locking portion of the rim. The closure including a side wall, a flange extending perpendicular to the side wall, and a locking lug disposed within the flange for engaging the corresponding locking lug of the container. The flange may include a gap portion disposed adjacent to the locking lug for allowing a user to deflect the deflectable locking portion of the container through the gap portion in the flange to disengage the locking lug of the container from the locking lug of the closure.