Tall, grande, venti—cups for each drink size have mysterious lines on the sides. What exactly are those markers used for?

Although iced coffee has been around for decades ... Better yet, the ice didn't melt as quickly as it would in a plastic cup because the stainless steel inner core of the tumbler kept my drink ...

Freezing your coffee to add in a future cup is one of the best uses for ... just be sure to cover the ice cubes with a lid or ...