A retractable shoulder strap for towing wheeled luggage with minimal to no hand assistance and that can be easily stored and worn comfortably. The retractable shoulder strap includes a housing, a retraction mechanism, a shoulder strap, a strap-adjustment slide, an elastic strap, and a handle-attaching system. The housing contains and conceals the retraction mechanism. The retractions mechanism allows the shoulder strap to be automatically retracted into the housing when not be utilized by the user. The shoulder strap allows the user to carry a load on his or her shoulder. The strap-adjustment slide allows the user to adjust the length of the shoulder strap, when extended from inside the housing. The elastic strap absorbs shocks produced when the user is towing wheeled luggage. The handle-attaching system allows the user to attach the retractable shoulder strap to a handle of wheeled luggage.