Which knock box do you use and why? I've been using a repurposed plastic box next to my espresso machine as my go-to knock box, but recently wrote a guide on knock boxes. I'm curious if you can recommend any particular knock box? They all seem universally the same and universally expensive.
Osaka, Shock-Absorbent Espresso Knock Box 4.7 Inch Barista Style Knockbox.

about $20 anywhere online