What is the meaning of [Bag and baggage]

One’s bag and baggage is the sum total of one’s possessions.

The phrase is of military origin. ‘Bag and baggage’ referred to the entire property of an army and that of the soldiers in it. To ‘retire bag and baggage’ meant to beat an honourable retreat, surrendering nothing. These days, to ‘leave bag and baggage’ means just to clear out of a property, leaving nothing behind.

The phrase is ancient enough that the earliest citation isn’t in contemporary English. Rymer’s Foedera, 1422, has:

“Cum armaturis bonis bogeis, baggagiis.