If you’re a fan of high-quality porta-filter espresso, then you’ll appreciate how important a device a decent knock-box is. When you’re done making your brew, your grounds will still remain in the filter, compressed into a neat puck by the tamping process. But since they’re soaked through, they’ll stick to the sides a little, and so getting rid of them presents a challenge. Fortunately, it’s a challenge that can be overcome in a very satisfying way – by whacking the filter against a knock-box. To withstand these impacts and last the distance, a good knock-box should be very ruggedly constructed. This particular offering, from Crema, is just that. It comes with a rubberised bar spanning the middle of the receptacle, which will happily absorb all of those knocks. You can even replace the rubber sleeve if it should ever become worn-out. And since the bottom is rubberised, it’ll stick to the counter as you’re doing your knocking. This is the smaller of two versions of this knock-box, standing at just 110mm tall. It’s a compact solution, but it still provides room enough for around ten pucks. When it looks almost full, simply eject the container into your kitchen bin. What could be more straightforward?