Cal. Health & Safety Code § 8345

If a cremated remains container is of insufficient capacity to accommodate all cremated remains of a given deceased, the crematory shall provide a larger cremated remains container at no additional cost, or place the excess remains in a secondary cremated remains container and attach the second container, in a manner so as not to be easily detached through incidental contact, to the primary cremated remains container for interment, scattering, or other disposition by the person entitled to control the disposition.