A container closure system, comprising: a container comprising a neck having an outer surface, the neck including a plurality of snap ring segments alternating with a plurality of snap ring voids positioned around a circumference of the outer surface, the length of the circumference at which snap ring voids exist being 25% or more of the total length of the circumference, wherein the plurality of snap ring segments are positioned at regular increments around a circumference of the outer surface, the increments being measured from the midpoint of each of the snap ring segments on the circumference of the outer surface; and a cap comprising a skirt with an orifice positioned therein, a plug assembly for blocking and unblocking the orifice, and a base extending from the skirt and surrounding the orifice, the base comprising a plurality of snap prongs arranged so as to engage and disengage the plurality of snap ring segments when the cap is rotated on the neck of the container, the plurality of snap prongs configured to hold the cap on the container when engaged with the plurality of snap ring segments and to release the cap from the container when the plurality of snap prongs are disengaged from the plurality of snap ring segments, characterized in that the plurality of snap ring segments comprises a first snap ring segment positioned adjacent to a second snap ring segment, a first portion of the outer surface extending between the first and second snap ring segments; and a third snap ring segment positioned adjacent to a fourth snap ring segment, a second portion of the outer surface extending between the third and fourth snap ring segments, wherein a side of the first snap ring segment, a side of the second snap ring segment and the first portion of the outer surface form a first planar surface, and wherein a side of the third snap ring segment, a side of the fourth snap ring segment and the second portion of the outer surface form a second planar surface, the first planar surface opposing the second planar surface, the first and second planar surfaces being located perpendicular to a part line. a container comprising a neck having an outer surface, the neck including a plurality of snap ring segments alternating with a plurality of snap ring voids positioned around a circumference of the outer surface, the length of the circumference at which snap ring voids exist being 25% or more of the total length of the circumference, wherein the plurality of snap ring segments are positioned at regular increments around a circumference of the outer surface, the increments being measured from the midpoint of each of the snap ring segments on the circumference of the outer surface; and a cap comprising a skirt with an orifice positioned therein, a plug assembly for blocking and unblocking the orifice, and a base extending from the skirt and surrounding the orifice, the base comprising a plurality of snap prongs arranged so as to engage and disengage the plurality of snap ring segments when the cap is rotated on the neck of the container, the plurality of snap prongs configured to hold the cap on the container when engaged with the plurality of snap ring segments and to release the cap from the container when the plurality of snap prongs are disengaged from the plurality of snap ring segments, characterized in that the plurality of snap ring segments comprises a first snap ring segment positioned adjacent to a second snap ring segment, a first portion of the outer surface extending between the first and second snap ring segments; and a third snap ring segment positioned adjacent to a fourth snap ring segment, a second portion of the outer surface extending between the third and fourth snap ring segments, wherein a side of the first snap ring segment, a side of the second snap ring segment and the first portion of the outer surface form a first planar surface, and wherein a side of the third snap ring segment, a side of the fourth snap ring segment and the second portion of the outer surface form a second planar surface, the first planar surface opposing the second planar surface, the first and second planar surfaces being located perpendicular to a part line.