I’m not kidding!
Labeling is a form of communication. I believe that you should label the outside of every container you use. Identify the category of what’s inside (like craft supplies). It’s even worth the extra effort to be more specific on what’s inside, so you can more easily find what you are looking for (like glue and tape).
Use pictures as labels if you have young children. They can draw the pictures for you or you can cut out photos right off a box to make picture labels.
Try it. You’ll find that you will spend less time searching for things.