Suspended Animation Chamber

Colloquially referred to as a "SAC", this is the dragon's second stomach which they use to transport items.

The Suspended-Animation-Chamber (SAC) is a second stomach located after the dragon's ribcage. During interplanetary flight, it fills with Dragon Dust, which is a liquid very like perfluorocarbons, with a trademark scent. Dragon dust sends anyone who inhales it into a state of suspended animation. The original use of the SAC was to transport treasures (both biological and not) to the dragon's home. The dragon dust has a very high specific heat, meaning it heats and cools very slowly. This allows the dragon to encounter vast changes in temperature without fearing harm to its passengers