We used a square "Happy Birthday" helium balloon. For the parachute we attached a coffee filter under the balloon. Then we made a paper camera that we taped to the string of the balloon just about two inches under the parachute. Then we folded up a piece of paper to make it form into a box and taped it together as a payload. In the payload, we put a satellite tracker, a thermometer, a flight computer, and an audio beacon. We used 4 paper clippers to way it down, we only added 4 because if we used more than that it would weigh down. Our weather balloon weighed 2.8 grams.
Thank you for your interest in contacting Future Engineers. We look forward to connecting with you!