"Luggage" and "baggage" are synonyms when used to mean "the suitcases you are
carrying". However, "baggage" has extended meanings.
An army, at least in olden times, was followed by a "baggage camp", never a
"luggage camp".
"Politician X has excess baggage" does not refer to suitcases but rather to
scandals or emnities or such.
- James A. Landau