(TheDrinksBusiness) - Penfolds may have created the perfect closure solution by doing away with a stopper altogether, although it doesn’t come cheap. In our final piece on closures we have searched for the ideal way to close a wine, having considered the most common options already on the market, from cork, to screwcap and finally hi-tech synthetics. However, could glass be the best material for stoppering bottles because it is an entirely inert material, ensuring it won’t react with the wine, nor biodegrade. Although there are glass stoppers on the market from Vino-Lok, these contain plastic – Elvax® eythylene-vinyl acetate – to hold the closure in place and prevent wine leaking down the sides of the bottleneck.