What type of glass is used for cocktails that include a filler?

The appropriate choice for cocktails that include a filler is the highball glass. Highball glasses are designed to hold cocktails that typically have a significant amount of mixer or filler, such as soda, tonic water, or juice, in addition to the base spirit. Their taller and narrower shape allows for a larger volume, accommodating the added mixers while maintaining the integrity of the drink's flavors.

Cocktails served in highball glasses often contain a spirit combined with a non-alcoholic filler, making them refreshing and easy to drink, which aligns with the purpose of this glass type. The design also helps maintain the drink's carbonation and chill, enhancing the overall experience.

Other glass types, such as rocks glasses, are more suited for drinks served straight or with minimal mixers, while shot glasses are used for serving spirits in smaller quantities. Coupe glasses, on the other hand, are typically used for cocktails served straight up without a filler, focusing more on the presentation rather than the volume of the drink. Thus, highball glasses stand out as the optimal choice for cocktails that involve a filler.