Imagine that under the first ray of sunshine in the morning, a huge colorful hot air balloon slowly rises into the sky. This is the world's largest hot air balloon - City in the Sky. The design concept of Sky City stems from the desire to fly freely and explore the unknown world. The area is large and can accommodate dozens of people at the same time. This enables passengers to enjoy high-altitude travel. This large hot air balloon is made of high-strength lightweight materials, making it safe and durable. There are multiple independent air chambers inside the sphere. And the height and direction can be adjusted according to the actual situation to achieve more precise control.