I quite enjoy cereals that have a range of different ingredients - like oat clusters with freeze dried strawberry or museli with almonds and raisins. Over time though, the oats rise to the top and the smaller bits get trapped at the bottom so when you’re near the end of the packet it’s 70% dust.
Is there an easy way to prevent this? It’s hard to mix up the contents without breaking up everything into smaller bits. And shaking up the packet just makes the separation worse.
Particles are going to settle at roughly the same rate either orientation.
So the spectrum will be the same at any orientation except the effect will be more or less pronounced. With flat storage leading to the least granular separation while also being inconvenient to practically store.