What's the Opaque Bottle of Ginger Beer?

A woman ordered a bottle of ginger beer, and it was in an opaque bottle. If something is opaque, it means you can't see through it. The people serving the ginger beer weren't able to see what was inside. E luke's english podcast mug is also opaque. Can you hear that? Listeners? XEnglishPods are not transparent. They're just like wine glasses but they don't make them visible.