With the milk molar upgrades increasing how much chests can hold, I think there should be a "defrag" option for the chests, as there is for the backpack. That way if you're a hoarder like me, you can even out all your stacks, and maximize your storage.

Absolutely. I'm not sure why there is not one already. My son and I have to constantly go through it to be sure we are not wasting space. Our solution was to make individual chests which is a Pain.