The optimized, ergonomic shape of the screw cap has comfortable grooves and ridges for a more efficient and easier tightening or removal, especially with smaller sized or gloved hands. The inverted cone form of the cap makes bottle handling easier and far safer. The shortened thread inside the cap permits faster opening and closing, yet it is fully compatible with standard DIN GL 45 glass bottle threads. The tried and tested cap plug sealing system ensures a liquid tight seal. A pre-defined labelling area on the cap is compatible with the dedicated DURAN® self-adhesive YOUTILITY label.