diff --git a/seismo_lab.py b/seismo_lab.py
index c1fbd3d..dc96d59 100644
--- a/seismo_lab.py
+++ b/seismo_lab.py
@@ -479,8 +479,10 @@ class BridgePanel(tk.Frame):
             logdir = self.logdir_var.get().strip() or "."
             os.makedirs(logdir, exist_ok=True)
             ts = datetime.datetime.now().strftime("%Y%m%d_%H%M%S")
-            bw_path = os.path.join(logdir, f"raw_bw_{ts}.bin")
-            s3_path = os.path.join(logdir, f"raw_s3_{ts}.bin")
+            safe_label = self._cap_label.replace(" ", "_") if self._cap_label else ""
+            suffix = f"_{safe_label}" if safe_label else ""
+            bw_path = os.path.join(logdir, f"raw_bw_{ts}{suffix}.bin")
+            s3_path = os.path.join(logdir, f"raw_s3_{ts}{suffix}.bin")
             with self._tcp_cap_lock:
                 self._tcp_cap_bw_fh = open(bw_path, "wb")
                 self._tcp_cap_s3_fh = open(s3_path, "wb")