I have jars for my soda crystals as they come in a crappy bag, then flour & sugar as the bags do my head in. I do have labels on the front of those just for me to know.
I have cereal in the cupboard in jars as the boxes don't fit but no labels, I assume people can see its bloody cereal & don't need telling
Same with if I ever need to stick the rice or pasta in anything, they're see through, we can actually see what's in them?!
Spices are left in their perfectly see through, funnily enough, already labelled, containers!