I have seen demonstrations of hot air balloons using plastic garment bags from
the dry cleaner's. The air was heated with a heat gun, but a hair drier might
work.
Roger
Roger A. Pruitt
Physics Department--Fort Hays State University
600 Park Street e-mail: phrp@fhsuvm.fhsu.edu
Hays, KS 67601 v-mail: 913-628-5357