Side benefit to couponing

I realized recently that there is a side benefit to couponing. I have actually been able to start collecting Box Tops for Education for the school. For the past several years, I've rarely bought anything that had a box top on it. So now I've got a nice little baggie going that I"m filling with box tops. After I get several, I'll send it to school with my little school-age boy that I keep.