Abstract: A bottle or like container of relatively hard material such as glass is provided with a readily destructible neck extension portion of relatively soft plastics material. A dispensing optic for screwing into the neck extension has a cutter or cutters arranged to be projected from their retracted state, by the first operation of the optic after insertion into the neck extension, into cutting engagement with the wall of such extension. Rotation of the optic with a view of removing it from the bottle automatically causes the cutter or cutters to sever the neck extension to render the bottle unsuitable further with a dispensing optic and thus prevents re-filling of the bottle with an inferior product and the dispensing of such product through a dispensing optic.