When I was in middle school I stayed late after school, waiting for my mom to pick me up. I went into the gym where all the students would hang out before classes started and I saw a 2 huge piles of paper, the biggest one being blank paper. Next to it was a pile of working pens.
That basically traumatized me, seeing how wasteful everyone was. I take paper/pens/pencils if I see they were abandoned, and if I can, I give them back to the people who left them.
I have a cabinet full of paper,pens,pencils,binders, I have no back to school shopping when it comes to supplies.