def METHOD_NAME(self):
    """Writes a manifest file into bag top-level directory"""
    manifest = ""
    for blob in self.blobs:
        manifest = manifest + blob["name"] + "\t" + blob["md5sum"] + "\n"
    manifest_blob = self.bucket.blob(f"{self.bag}/{FIXITY_MANIFEST_NAME}")
    manifest_blob.upload_from_string(manifest)
    print(f"Wrote manifest file for {self.bucket_name}:{self.bag}")