Originally Posted by
AnalogMan
Is the cargo hold pressurized to the same level as the cabin?
Yes. It would be very expensive to have separate pressure vessels and separate controls. More complexity and more weight.
Originally Posted by
RockoHorse
Any items should be ok as long as they have air in them which can expand and contract
Actually, just the opposite. It is the air that expands and contracts, not the liquid, so the less air in the sealed container the better. The liquid does not expand.