For a very short time, Migros had the best toilet paper in the world! The Soft Comfort Travel. The large roll had a small roll in the middle instead of a cardboard tube. The advantages were: you could take the small roll with you, e.g. for camping, traveling or you could simply use it at home. You had more paper and so it was packed more efficiently. Another big advantage was that you didn't have a cardboard roll to dispose of... when the roll was finished, you could immediately add the next one.
Wouldn't it be great if these rolls came back into the range?