Psychoanalytical psychopathology sheds light on the technique of packing. But recent neurophysiological, developmental, psychopathological and institutional studies have come together to enable this treatment practice to construct a psychotherapeutic setting for autistic and psychotic children and adolescents, as long as this is part of a complex institutional structure that takes into account all aspects necessary to the care of the patient in question. The vehement attacks of its detractors are put into perspective by the good clinical results it produces, about which a program of clinical research will issue a report in the coming months.