I learned a long time ago from Japanese businesses that when they were done with paper sheets they would cut them up into quarter sizes for the back side of the paper to be reused.

I have been recycling my printer paper that was no longer needed or error prints for years. I would rough tear them by hand into quarter sheet size. I never really had a good storage solution for that paper until now.

This is a Quarter Sheet Paper and 5 Pen Holder.

I know it fits quarter sheet US letter size paper.

The paper storage area is oversized and should fit A4 paper cut into quarters, but I have not confirmed fitment in real live. Let me know if A4 fits.