Floating on the Wind

I can fly high into the sky. I'm not a bird. I'm not alive. I am very big! Usually I am shaped like a big, round ball. I can have other funny shapes, though. I could be shaped like a hot dog or an animal. I could be shaped like a castle or a bug.

I am made of cloth. I have an opening at the bottom. Under the opening is a heater. It is called a burner. The burner heats the air inside me. Hot air is lighter than cold air. That makes me go up, up, up!