A closure for use on a container having an externally threaded neck is
disclosed wherein an inner surface of a downwardly depending skirt portion
of the closure cap includes a helical thread having a flat upper surface
with a lower thread profile having a first depth greater than an upper
thread profile of a second depth. The helical thread of the closure tapers
into the sidewalk of the closure skirt. The closure is provided with a
seal integral with the inner surface of the skirt, spaced from a top wall
of the closure, and retained at a lowermost point along the downwardly
depending skirt by a bead.
