Pizza is awesome. We don't think there's any debating that fact. However, the boxes they come in aren't the easiest to store or throw away. They can end up taking up a lot of room even when there are only a couple of slices left. But it turns out that they're actually made to be refolded and sized down. Just tear off the top of your pizza box, along with the sides.
Next, fold the box over, and it should close the same as it would if there was still a top on the box. You can then easily store it in your fridge for the next day.