This REALLY IS an easily executed project. This is an eye-opening, fun activity. Students will need access to online research (tablet), bathroom scale, plastic gloves and class trash. The trash comes from the wastepaper baskets from other classrooms in your building. The project provides opportunities for collecting data; conducting (quick) research; drawing conclusions based on data and experiencing a real-world ecological problem in a way they can understand.
My students were very impressed and a bit overwhelmed when they extrapolated their data.