Beer Savers, or a lid for your bottle is a new concept recently launched by Beer Interactive. It is simply a silicon closure, slightly stretchable to fit a bottle opening. Not everybody has an articulated need for resealing their 33cl beer bottle. But this cap not only identifies your bottle in the bar/night club scene it also makes it more difficult for bad guys to tamper your beverage.
It is of course also a cool thing to use for promoting your bottled beer brands. Cheers.