A while back I decided to organize my pantry. One of the things I didn't do when I originally completed the project was to label my containers. Just last weekend I finished labeling all of the containers in my pantry.
It only took five minutes but it will save me a ton of grief. Look at the photo above. If those canisters weren't labeled how would I know what was in them? White flour doesn't really look different from bread flour.
Anyway, label, label, label. You'll be glad you did.