Unlike some other cocktails, there's lots of flexibility when it comes to choosing a glass for your gin and tonic, and you can choose whatever style you prefer. A highball glass (or a tall and skinny collins glass) is a classic choice with plenty of room for both ice and garnish. A lowball or rocks glass, as shown here, holds less ice but makes for a simple and attractive presentation. Lastly, a copa glass (shaped like a balloon or bowl and similar to a red wine glass), is a great choice since its shape enhances the gin's aromatics and it also has plenty of room for ice and garnish.