For which drink are the iced drink fill lines specified?

The iced coffee is the drink for which the fill lines are specifically indicated because proper beverage preparation relies on accurate measurements to ensure consistency in flavor and strength. The fill lines help baristas achieve the desired balance of coffee to ice, which is crucial in maintaining the intended taste profile of the iced coffee. This precision is not only important for the customer experience, ensuring that each drink meets the brand's standards, but also beneficial for baristas during busy periods, as it streamlines the preparation process. Other drinks, such as hot coffee or caffeinated smoothies, do not have such specifications for fill lines, as their preparation involves different methods and considerations, like brewing and blending rather than pouring over ice.