diff --git a/autotest/t027_test.py b/autotest/t027_test.py
index 6c0153a905..cd035b91bc 100644
--- a/autotest/t027_test.py
+++ b/autotest/t027_test.py
@@ -68,7 +68,8 @@ def test_mnw1_load_write():
     m2 = flopy.modflow.Modflow.load('mnw1.nam', model_ws=cpth,
                                    load_only=['mnw1'],
                                    verbose=True, forgive=False)
-    assert m.stress_period_data == m2.stress_period_data
+    for k, v in m.mnw1.stress_period_data.data.items():
+        assert np.array_equal(v, m2.mnw1.stress_period_data[k])
 
 def test_make_package():
     """t027 test make MNW2 Package"""
diff --git a/flopy/export/utils.py b/flopy/export/utils.py
index 80af2aa469..70055fb410 100644
--- a/flopy/export/utils.py
+++ b/flopy/export/utils.py
@@ -285,8 +285,8 @@ def output_helper(f, ml, oudic, **kwargs):
         if ml.bas6:
             mask_vals.append(ml.bas6.hnoflo)
             mask_array3d = ml.bas6.ibound.array == 0
-        if ml.bcf:
-            mask_vals.append(ml.bcf.hdry)
+        if ml.bcf6:
+            mask_vals.append(ml.bcf6.hdry)
         if ml.lpf:
             mask_vals.append(ml.lpf.hdry)
 
diff --git a/flopy/mbase.py b/flopy/mbase.py
index 036e5a3766..e163a4846f 100644
--- a/flopy/mbase.py
+++ b/flopy/mbase.py
@@ -195,6 +195,7 @@ def __init__(self, modelname='modflowtest', namefile_ext='nam',
         self.heading = ''
         self.exe_name = exe_name
         self._verbose = verbose
+        self.external_path = None
         self.external_extension = 'ref'
         if model_ws is None: model_ws = os.getcwd()
         if not os.path.exists(model_ws):
@@ -507,8 +508,10 @@ def __getattr__(self, item):
         if item == "_packagelist" or item == "packagelist":
             raise AttributeError(item)
         pckg = self.get_package(item)
-        if pckg is not None:
+        if pckg is not None or item in self.mfnam_packages:
             return pckg
+        if item == 'modelgrid':
+            return
         raise AttributeError(item)
 
     def get_ext_dict_attr(self, ext_unit_dict=None, unit=None, filetype=None,
diff --git a/flopy/modflow/mfsfr2.py b/flopy/modflow/mfsfr2.py
index 2a73c11317..ac96bcb17a 100644
--- a/flopy/modflow/mfsfr2.py
+++ b/flopy/modflow/mfsfr2.py
@@ -1978,6 +1978,7 @@ def __init__(self, sfrpackage, verbose=True, level=1):
             self.sr = self.sfr.parent.modelgrid.sr
         except AttributeError:
             self.sr = self.sfr.parent.sr
+            self.mg = None
 
         self.reach_data = sfrpackage.reach_data
         self.segment_data = sfrpackage.segment_data
diff --git a/flopy/mt3d/mt.py b/flopy/mt3d/mt.py
index 558d36fd0c..d7dd522296 100644
--- a/flopy/mt3d/mt.py
+++ b/flopy/mt3d/mt.py
@@ -243,6 +243,7 @@ def __init__(self, modelname='mt3dtest', namefile_ext='nam',
         self.ftlfilename = ftlfilename
         self.ftlfree = ftlfree
         self.ftlunit = ftlunit
+        self.free_format = None
 
         # Check whether specified ftlfile exists in model directory; if not,
         # warn user
diff --git a/flopy/seawat/swt.py b/flopy/seawat/swt.py
index 6b147e0691..2295ededd3 100644
--- a/flopy/seawat/swt.py
+++ b/flopy/seawat/swt.py
@@ -90,6 +90,9 @@ def __init__(self, modelname='swttest', namefile_ext='nam',
         self.version_types = {'seawat': 'SEAWAT'}
         self.set_version(version)
         self.lst = SeawatList(self, listunit=listunit)
+        self.glo = None
+        self._mf = None
+        self._mt = None
 
         # If a MODFLOW model was passed in, then add its packages
         self.mf = self
@@ -160,7 +163,7 @@ def modelgrid(self):
         if not self._mg_resync:
             return self._modelgrid
 
-        if self.bas6 is not None:
+        if self.has_package('bas6'):
             ibound = self.bas6.ibound.array
         else:
             ibound = None
diff --git a/flopy/utils/util_list.py b/flopy/utils/util_list.py
index 229954e98e..2f85ea146f 100644
--- a/flopy/utils/util_list.py
+++ b/flopy/utils/util_list.py
@@ -251,7 +251,7 @@ def fmt_string(self):
             use_free = self.list_free_format
         else:
             use_free = True
-            if self.package.parent.bas6 is not None:
+            if self.package.parent.has_package('bas6'):
                 use_free = self.package.parent.bas6.ifrefm
             # mt3d list data is fixed format
             if 'mt3d' in self.package.parent.version.lower():