Okay, seriously, who thinks large holes in a cinnamon jar is a good idea?
Holes like these:
... mean that the spice dumps out fast into the oatmeal bowl or cookie batter or whatever. I mean, if your goal is to sell more spice, I guess the larger hole is the correct design choice, but really, no.
So, I switched spice tops:
Now, the spice flows more slowly, and at a better rate.