The Solar Bag
You’ve never seen a solar bag like this! It’s 50 feet long, 3 feet in diameter, thin, black plastic and holds over 350 cubic feet of air. Simply fill with air by running, tie off the ends, and let the energy of the sun heat the air inside the bag. Within approximately five minutes, the bag will rise into the sky. Amazing to see. Excellent detailed instructions allow you to explore the principles of solar energy, density, and buoyancy.