Why are there two rolls of toilet paper in the hotel bathroom?

On the one hand, it is used as a disposable pad paper, on the other hand, it is used as a backup. With the improvement of people's living standards, people's requirements for sanitary conditions have also increased. One side is used as a pad instead of a disposable toilet pad, and the other side is used. Of course, there is no difference between the two rolls of paper, and they can be used instead of each other. This is what I said on the other hand, and it also solves the problem of paper shortage and reduces the replacement frequency of toilet paper.