The TIARA RING™ cap concept is based on an innovative design and offers a particularly resource-saving solution. The reduced weight not only saves on materials, but also maximizes the ecological and economic benefits. The shoulder-free cap also enables significant weight savings. Initially, the focus is on a diameter of 50 mm, which results in a saving of 1/3 compared to conventional flip-top closures, including the tube shoulder. An eye-catcher compared to conventional closures.