You can use any cup size with the Uccello Kettle, however, if you use a tall cup or travel mug you will need to tilt the tall cup to fill it. The assumption is that if you are able to use a tall cup or travel mug you will be able to tilt the tall cup to fill it.

Alternatively, you can also remove the kettle vessel from the base and pour, although this is not the desired way to use the Uccello Kettle.