Coffee dosage tray with a water sprayer (wetting the beans helps to stick the grounds together, so they are easier to distribute and don't stick to the housing of the grinder, which otherwise happens due to electrostatics).
That's just to pour them into a quite narrow funnel, not all grinders have a large volume. Take the Hario for example, the opening is just about 1 inch wide:
A wide container allows for the water spray to hit the beans evenly, and the spout helps funnel them into the narrower opening of the grinder after having sprayed the beans.
I know these things but don't have either. I don't single dose (just weigh the grind output) and the static isn't that bad in Florida so I have never had a need. People however know these things because popular coffee youtubers talk about it constantly.