There are various ways to latch a closure onto a container. It has been found that for blowmolded containers 30 that the support flange 36 for the bottle preform can later be used as a part of the latch mechanism 14 to secure a closure 10 onto the container. Preforms have a support flange by which the preform is handled prior to being placed into the mold and in the mold. Prior to being placed in the mold, the preform is heated to about 85 °C to about 200 °C. During this time and in the mold, it will be supported by the support flange. This support flange is used after the container is blown and filled as one part of the latching mechanism of the closure. The closure will have a portion that is an interference fit with the support flange of the bottle to thereby secure the closure to the bottle.