With the Solar Balloon Kit, discover the unique sensation of flying a DIY object. The kit contains all the material and instructions necessary for the construction of a solar balloon 4 meters in diameter, flying thanks to the energy of the sun and carrying up to 1 kg of payload. This kit can also be used as a refill for the Weather Balloon project, that is to say that the balloon carries a weather station. Solar Balloons can fly many consecutive times but can not be deconstructed.
Available online here