| Answer | Crossword Clue |
|---|---|
| envelopes | The structure within a balloon or nonrigid airship containing the gas |
| gasbags | The container holding the gas in a balloon or airship |
| gasbag | The container holding the gas in a balloon or airship |
| ballonets | The compartment in a balloon or airship into which air or another gas can be forced in order to maintain the craft's shape as buoyant gas is released |
