My sanding rolls always had a tendency to roll away and fall to the ground. So I decided to create a dedicated storing space for my most needed grits 80, 120, 180, and 240:
Basically it is just two long pieces of OSB and five dividers which also holds a steel rod. The rod is heavy enough to prevent everything from coming out when I unroll some paper. There is also some copper tube which is intended to hold the ends in place. The front piece has a sharp edge so I can tear off the paper easily.