What is the best glass for Gin Tonic? The most used glass for Gin Tonic is the balloon, also called copa. Its wide shape allows plenty of ice, keeps the drink cold longer and better releases the aromas of gin and botanicals. Large goblets are also a valid choice, especially when looking for elegant and versatile service. The balloon is ideal for those who want a specific Gin Tonic glass, while a wide goblet is more versatile and can also be used for Spritz, aperitif cocktails and mixed drinks.