Presso's sleek plastic knock box is the "mess-less" mini-bin to knock Your spent puck out into between and after pulling Your shots. This keeps the area clean and barista crew focused on the actual coffee-making by eliminating the "cleaning up part." ... knock-knock ...
I used to just throw my grounds in the bin using some momentum so it wouldn't touch the bin. Now I have this handy little box I can knock into between cups. You can live without it but makes life so much easier!