We tested the Puck Sucker and liked it, though we can't universally recommend the knock box. Go into a coffee shop and you’ll hear the thwacking of baristas knocking out spent espresso pucks.

Basically, a knock box is a box that you'll be knocking (get it?) your portafilter against to dump out the wet, used coffee puck. The Breville knock box features a rubber interior that's safe to ...