Used to refer to a large suitcase or bag.
Llevé mi maletón al aeropuerto, lleno de recuerdos de mis viajes pasados.
I took my large suitcase to the airport, filled with memories of my past travels.
Llevé un maletón enorme lleno de ropa para mi viaje de una semana.
I took a huge suitcase full of clothes for my week-long trip.