To provide a returnable packaging system and a packing method wherewith packing works can be executed easily while reducing the quantity of wastes.

The returnable packaging system 1 comprises an exterior case 10 formed in accordance with the shape of a bumper 60 to be packaged, a first inner packaging bags 20 and second inner packaging bags 30, and the inner packaging bags 20 and 30 are equipped respectively with valves which are in a structure of inducting and discharging air.