Constructing Mini Hot Air Balloon for Physics Olympics

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A group of four is seeking advice on constructing a mini hot air balloon for a Physics Olympics competition, with a maximum diameter of 50 cm and powered solely by a candle with up to three wicks. They are unsure about the best materials to use for the balloon to ensure it can lift weights effectively. Suggestions include considering a cylindrical design instead of a spherical one and studying existing products like sky lanterns for inspiration. Resources such as instructional videos on lighting lanterns were recommended for design ideas. The discussion emphasizes the importance of material selection and construction techniques for successful balloon flight.
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First , i am sorry if i posted on a wrong section because I am just new here .
We , as a group of four ,need some ideas on constructing a hot air balloon with maximum diameter of 50cm (for balloon) and it should be powered only by candle (made or bought) with maximum of 3 wicks for our Physics Olympics (school competition). My problem is , i don't know what is the best material for the whole hot air balloon so it can lift up with weights on it ,and also how to construct a balloon (currently i am searching for guides on how to make) so i am here asking for some help . Thank you
 
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A quick calculation shows that you aren't going to do this with a spherical balloon think cylinder.
 

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