the.com/baggage
The luggage you check at the airport and the luggage you never unpack from your ex.
means Either the suitcases and bags you travel with, or the emotional and psychological burdens you carry from past experiences.
from From Old French 'bagage,' the gear and bundles an army hauled along; the emotional sense arrived in the 20th century, because hearts pack heavier than soldiers.
Military rootOnce meant an army's portable equipment and supplies.
Insult eraOnce meant a worthless or impudent woman.
Therapy speakEmotional sense popularized by 20th-century psychology.