diff --git a/pyproject.toml b/pyproject.toml
index 951ce53..2ab3f93 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "pytrajplot"
-version = "2.1.1"
+version = "2.1.2"
 license = "BSD-3-Clause"
 authors = ["Michel Zeller", "Marco Ketzel", "Pirmin Kaufmann <pirmin.kaufmann@meteoswiss.ch>", "Peider Könz", "Victoria Cherkas", "Paulina Grochal"]
 description = "Plot LAGRANTO trajectories starting/ending at the same location on a map together with vertical cross sections"
diff --git a/pytrajplot/utils.py b/pytrajplot/utils.py
index 86a92a1..e3c8c76 100644
--- a/pytrajplot/utils.py
+++ b/pytrajplot/utils.py
@@ -2,6 +2,7 @@
 
 # Standard library
 import logging
+import os
 
 _PRODUCT_TYPE_MAP: dict[str, str] = {
     "ICON-CH1-EPS": "forecast-iconch1eps-trajectories",
@@ -13,10 +14,14 @@ def get_product_type(model_name: str) -> str:
     """Derive the product_type identifier from a model name.
 
     Falls back to a generated name if the model is not in the map.
+    Appends a suffix when PRODUCT_TYPE_SUFFIX is set (e.g. '-test').
     """
     product_type = _PRODUCT_TYPE_MAP.get(model_name.upper())
     if product_type is None:
         product_type = f"forecast-{model_name.lower().replace('-', '')}-trajectories"
+    suffix = os.environ.get("PRODUCT_TYPE_SUFFIX", "")
+    if suffix:
+        product_type += suffix
     return product_type