diff --git a/src/pytest_mock_resources/config.py b/src/pytest_mock_resources/config.py
index c48e5822..b8f37a48 100644
--- a/src/pytest_mock_resources/config.py
+++ b/src/pytest_mock_resources/config.py
@@ -20,9 +20,9 @@ def is_docker_host():
         return True
 
 
-def get_env_config(name, kind):
+def get_env_config(name, kind, default=None):
     env_var = "PMR_{name}_{kind}".format(name=name.upper(), kind=kind.upper())
-    return os.environ.get(env_var)
+    return os.environ.get(env_var, default)
 
 
 def fallback(fn):
diff --git a/src/pytest_mock_resources/container/mongo.py b/src/pytest_mock_resources/container/mongo.py
index 185bab16..6085c133 100644
--- a/src/pytest_mock_resources/container/mongo.py
+++ b/src/pytest_mock_resources/container/mongo.py
@@ -51,5 +51,9 @@ def check_mongo_fn(config):
 
 @pytest.fixture(scope="session")
 def _mongo_container(pmr_mongo_config):
-    result = get_container(pmr_mongo_config, {27017: pmr_mongo_config.port}, {}, check_mongo_fn)
-    yield next(iter(result))
+    yield from get_container(
+        pmr_mongo_config,
+        ports={27017: pmr_mongo_config.port},
+        environment={},
+        check_fn=check_mongo_fn,
+    )
diff --git a/src/pytest_mock_resources/container/mysql.py b/src/pytest_mock_resources/container/mysql.py
index 6afdf1c7..f6d2820e 100644
--- a/src/pytest_mock_resources/container/mysql.py
+++ b/src/pytest_mock_resources/container/mysql.py
@@ -93,14 +93,12 @@ def check_mysql_fn(config):
 
 @pytest.fixture(scope="session")
 def _mysql_container(pmr_mysql_config):
-    result = get_container(
+    yield from get_container(
         pmr_mysql_config,
-        {3306: pmr_mysql_config.port},
-        {
+        ports={3306: pmr_mysql_config.port},
+        environment={
             "MYSQL_DATABASE": pmr_mysql_config.root_database,
             "MYSQL_ROOT_PASSWORD": pmr_mysql_config.password,
         },
-        check_mysql_fn,
+        check_fn=check_mysql_fn,
     )
-
-    yield next(iter(result))
diff --git a/src/pytest_mock_resources/container/postgres.py b/src/pytest_mock_resources/container/postgres.py
index 665fcb8b..76f52ece 100644
--- a/src/pytest_mock_resources/container/postgres.py
+++ b/src/pytest_mock_resources/container/postgres.py
@@ -83,15 +83,13 @@ def check_postgres_fn(config):
 
 @pytest.fixture(scope="session")
 def _postgres_container(pmr_postgres_config):
-    result = get_container(
+    yield from get_container(
         pmr_postgres_config,
-        {5432: pmr_postgres_config.port},
-        {
+        ports={5432: pmr_postgres_config.port},
+        environment={
             "POSTGRES_DB": pmr_postgres_config.root_database,
             "POSTGRES_USER": pmr_postgres_config.username,
             "POSTGRES_PASSWORD": pmr_postgres_config.password,
         },
-        check_postgres_fn,
+        check_fn=check_postgres_fn,
     )
-
-    yield next(iter(result))
diff --git a/src/pytest_mock_resources/container/redis.py b/src/pytest_mock_resources/container/redis.py
index f0845567..7285b096 100644
--- a/src/pytest_mock_resources/container/redis.py
+++ b/src/pytest_mock_resources/container/redis.py
@@ -43,10 +43,9 @@ def check_redis_fn(config):
 
 @pytest.fixture(scope="session")
 def _redis_container(pmr_redis_config):
-    result = get_container(
+    yield from get_container(
         pmr_redis_config,
         ports={6379: pmr_redis_config.port},
         environment={},
         check_fn=check_redis_fn,
     )
-    yield next(iter(result))