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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.