diff --git a/src/random_events/flag.py b/src/random_events/flag.py
new file mode 100644
index 0000000..ca39e03
--- /dev/null
+++ b/src/random_events/flag.py
@@ -0,0 +1,81 @@
+from __future__ import annotations
+
+from typing_extensions import Type
+
+from .sigma_algebra import *
+from .utils import get_full_class_name
+
+from enum import Flag, IntFlag
+
+
+class Set(AbstractCompositeSet, IntFlag):
+    """
+    Experimental flag implementation.
+    """
+
+    # int flag overload block
+    __init__ = IntFlag.__init__
+    __or__ = IntFlag.__or__
+    __and__ = IntFlag.__and__
+    __sub__ = IntFlag.__sub__
+    __xor__ = IntFlag.__xor__
+    __eq__ = IntFlag.__eq__
+    __hash__ = IntFlag.__hash__
+    __contains__ = IntFlag.__contains__
+
+    @classmethod
+    @property
+    def EMPTY_SET(cls) -> Self:
+        return cls(0)
+
+    def to_string(self):
+        return IntFlag.__str__(self)
+
+    def complement_if_empty(self) -> Self:
+        return ~self.EMPTY_SET
+
+    def intersection_with(self, other: Self) -> Self:
+        return self & other
+
+    def complement(self) -> Self:
+        result = self.EMPTY_SET
+        for element in self.__class__:
+            if element not in self:
+                result |= element
+        return result
+
+    def union_with(self, other: Self) -> Self:
+        return self | other
+
+    @property
+    def simple_sets(self) -> SortedSet[AbstractSimpleSet]:
+        return SimpleSetContainer([element for element in self.__class__ if element in self])
+
+    def is_empty(self) -> bool:
+        return self == self.EMPTY_SET
+
+    def __lt__(self, other):
+        return int(self) < int(other)
+
+    def as_composite_set(self) -> Self:
+        return self
+
+    def simplify(self) -> Self:
+        return self
+
+    def new_empty_set(self) -> Self:
+        raise NotImplementedError("This method should not be called due to Flag operations.")
+
+    def make_disjoint(self) -> Self:
+        return self
+
+    def to_json(self) -> Dict[str, Any]:
+        return {**SubclassJSONSerializer.to_json(self),
+                "simple_set_class": self.simple_sets[0].cls_to_json(),
+                "simple_set_indices": list(map(lambda item: int(item), self.simple_sets))}
+
+    @classmethod
+    def _from_json(cls, data: Dict[str, Any]) -> Self:
+        simple_set_class = SetElement.cls_from_json(data["simple_set_class"])
+        simple_sets = [simple_set_class(index) for index in data["simple_set_indices"]]
+        return cls(*simple_sets)
diff --git a/test/test_flag.py b/test/test_flag.py
new file mode 100644
index 0000000..1589100
--- /dev/null
+++ b/test/test_flag.py
@@ -0,0 +1,25 @@
+import enum
+import unittest
+
+from random_events.flag import Set
+
+
+class TestFlag(Set):
+    A = enum.auto()
+    B = enum.auto()
+    C = enum.auto()
+
+
+class FlagTestCase(unittest.TestCase):
+
+    def test_intersection(self):
+        self.assertEqual(TestFlag.A.intersection_with(TestFlag.B), TestFlag(0))
+        self.assertEqual(TestFlag.A.intersection_with(TestFlag.A), TestFlag.A)
+        self.assertTrue(TestFlag(0).intersection_with(TestFlag.A).is_empty())
+
+    def test_invert(self):
+        self.assertEqual(TestFlag.A.complement(), TestFlag.B | TestFlag.C)
+
+
+if __name__ == '__main__':
+    unittest.main()