This knock box is sturdy (glad for the nonslip base and rubbery bar across the container) and can hold much more than you'd think. Comes apart for cleaning. This is one of those things that feels like an unnecessary extra expense early on when you buy an espresso machine, but it makes the prep process much more efficient and far less annoying. (Previously I was scraping out espresso into a garbage can below the sink, so... yeah, this is better).