1. LOTS of plastic grocery bags, about 500. You can either do the first steps of this project as you get grocery bags, or else you can ask friends and family or even collect them from grocery stores.
2. 2 carabiners. I used 7/16" Spring Link carabiners from Homedepot
3. 6 feet of thin rope. I used 3/16in x 100ft of Braided Nylon & Polypropylene Rope from Homedepot
4. Someplace to hang it. I attached it to a piece of ply wood held between two beams on my ceiling, but you can hang hooks in a ceiling or hang it from a tree outside.