a twist open , twist close outer plastic cap with a modified container neck having multiple annular fluid seals and a dispensing aperture located on an outer annular beveled corner of the cap . the twist open / close closure involves raising and lowering the cap on cooperatively structured threads on the neck of the container and interior of the outer plastic cap . two different consistencies of plastic material are used to structure the outer cap to provide a relatively rigid outer cap structure having a relatively soft interior surface for improved sealing against the neck of the container . a first stop block is located on the lower exterior of the container neck , and a second stop block aligned for abutment with the first block is located on the lower interior of the cap to limit rotation of the outer cap . cooperative alignable structures between the outer cap and the neck of the container causes a definite snap or vibration in the outer cap at about the moment the dispensing aperture is fully opened to alert the user to the open condition .