diff --git a/sentry_sdk/consts.py b/sentry_sdk/consts.py
index e6676f32af..cc200107f6 100644
--- a/sentry_sdk/consts.py
+++ b/sentry_sdk/consts.py
@@ -31,6 +31,8 @@
         total=False,
     )
 
+DEFAULT_MAX_BREADCRUMBS = 100
+
 
 # This type exists to trick mypy and PyCharm into thinking `init` and `Client`
 # take these arguments (even though they take opaque **kwargs)
@@ -39,7 +41,7 @@ def __init__(
         self,
         dsn=None,  # type: Optional[str]
         with_locals=True,  # type: bool
-        max_breadcrumbs=100,  # type: int
+        max_breadcrumbs=DEFAULT_MAX_BREADCRUMBS,  # type: int
         release=None,  # type: Optional[str]
         environment=None,  # type: Optional[str]
         server_name=None,  # type: Optional[str]
diff --git a/sentry_sdk/serializer.py b/sentry_sdk/serializer.py
index fc293f6a65..4dc4bb5177 100644
--- a/sentry_sdk/serializer.py
+++ b/sentry_sdk/serializer.py
@@ -188,8 +188,8 @@ def _is_databag():
             if p0 == "request" and path[1] == "data":
                 return True
 
-            if p0 == "breadcrumbs":
-                path[1]
+            if p0 == "breadcrumbs" and path[1] == "values":
+                path[2]
                 return True
 
             if p0 == "extra":
diff --git a/tests/test_client.py b/tests/test_client.py
index b6e5a5f174..9137f4115a 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -10,6 +10,7 @@
 from sentry_sdk import (
     Hub,
     Client,
+    add_breadcrumb,
     configure_scope,
     capture_message,
     capture_exception,
@@ -21,6 +22,8 @@
 from sentry_sdk.transport import Transport
 from sentry_sdk._compat import reraise, text_type, PY2
 from sentry_sdk.utils import HAS_CHAINED_EXCEPTIONS
+from sentry_sdk.serializer import MAX_DATABAG_BREADTH
+from sentry_sdk.consts import DEFAULT_MAX_BREADCRUMBS
 
 if PY2:
     # Importing ABCs from collections is deprecated, and will stop working in 3.8
@@ -611,6 +614,10 @@ def inner():
 
         (event,) = events
 
+        assert (
+            len(event["exception"]["values"][0]["stacktrace"]["frames"][0]["vars"]["a"])
+            == MAX_DATABAG_BREADTH
+        )
         assert len(json.dumps(event)) < 10000
 
 
@@ -860,3 +867,21 @@ def capture_event(self, event):
 
     assert not envelopes
     assert not events
+
+
+@pytest.mark.parametrize(
+    "sdk_options, expected_breadcrumbs",
+    [({}, DEFAULT_MAX_BREADCRUMBS), ({"max_breadcrumbs": 50}, 50)],
+)
+def test_max_breadcrumbs_option(
+    sentry_init, capture_events, sdk_options, expected_breadcrumbs
+):
+    sentry_init(sdk_options)
+    events = capture_events()
+
+    for _ in range(1231):
+        add_breadcrumb({"type": "sourdough"})
+
+    capture_message("dogs are great")
+
+    assert len(events[0]["breadcrumbs"]["values"]) == expected_breadcrumbs