A bulk cargo bag includes: an outer container body having an outer surrounding wall; and an inner container body having an inner bottom wall, and an inner surrounding wall extending upwardly from the inner bottom wall. The inner surrounding wall has a plurality of spaced apart reinforcing folds, and a plurality of fixing members. Each of the reinforcing folds has an outwardly bent portion, and a folded back portion. Each of the fixing members fixes the outwardly bent portion and the folded back portion of one of the reinforcing folds to the outer surrounding wall.