Particulate stuff that separates into layers in transit is a nuisance. In particular, we buy dog pellets which come in a tub and which are almost completely stratified by size when the food is delivered.
This is a problem because the pellets contain different nutrients and a dog on a protein-only diet seems very much harder to control.
Today’s invention is therefore a plastic spiral which is screwed into a (well mixed) tub of pellets in the factory.
This limits any stratification to the wavelength of the spiral, so that on withdrawal from the tub, much more uniform scoopfuls can be extracted.