What is the purpose of the funnel?

Use the AeroPress funnel to transfer the ground coffee from your coffee grinder bin to the AeroPress chamber. It was not an intended use but users have told us that the funnel fits on the bottom of the chamber and enables you to press into smaller mugs. If you do this, we advise you to make sure you use a sturdy mug and that you firmly hold the mug and AeroPress during pressing to avoid spilling.