Abstract: In one embodiment there is provided a novel container neck finish having a substantially cylindrical exterior wall surface surrounding an orifice defined in the container and a thread structure positioned about the exterior wall surface. The thread structure in one aspect has at least a first portion, a second portion positioned substantially axially below the first portion, and a third portion positioned substantially axially below the second portion. The first, second, and third portions, being inclined with respect to the other portions provide a screw on neck finish. The effective maximum diameter of the first portion is less than the effective maximum diameter of the second portion to define a first to second separation distance. And the effective maximum diameter of the second portion is less than the effective maximum diameter of the third portion to define a second to third separation distance.

Abstract: In one embodiment there is provided a novel container neck finish having a substantially cylindrical exterior wall surface surrounding an orifice defined in the container and a thread structure positioned about the exterior wall surface. The thread structure has at least a first portion and a second portion. Each portion has a corresponding effective maximum diameter, wherein the effective maximum diameter of the first portion is less than the effective maximum diameter of the second portion.