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My sister in law always comes up with the most creative ideas. I don’t know if you have the same problem that I have, but my kids use cup after cup after cup when we are out camping or at the beach. We waste so much and their mom goes a little crazy! 😉  This is a great idea. Write your name on your cup with a sharpie, hang it on clothes line or rope and re-use again an again! Tip:  Rinse the chocolate milk out of your cup  before hanging. (It kind of defeats the purpose!) 😉