Often when I print out items from the internet, like free knitting patterns, and so on, I end up with pages of almost empty printed pages. I gotten into the habit of saving them to use when I happen to run out of paper. You see, if I feed them into my printer with the printed side UP (you will have to check your own printer), I can them print on the opposite side. When I put together my stash of paper to re-use, I realized that I had quite a bit of paper there! It's a good practice to get into.