All in all, there's plenty to like about being the owner of a magnum of something good. Wine ages more slowly in larger bottles, so the 1.5 litre magnum is going to keep your wine fresher and more youthful. It also means that once you've opened it, with the use of a good stopper you can revisit it over several days. Less oxygen between the wine and the cork means the wine oxidizes more slowly than it does in a standard bottle, thereby retaining added flavour and nuance, an aspect that makes the magnum ideal for cellaring. With champagne, magnums also assist the wine to actually gain flavour, the yeast having more room to spread out and do its work. And then there's the sharing with friends aspect. Not just fun, versatile too.