diff --git a/seika/ecs/ec_system.c b/seika/ecs/ec_system.c
index e850cb1..42889b7 100644
--- a/seika/ecs/ec_system.c
+++ b/seika/ecs/ec_system.c
@@ -3,6 +3,7 @@
 #include "seika/utils/se_string_util.h"
 #include "seika/data_structures/se_queue.h"
 #include "seika/memory/se_mem.h"
+#include "seika/utils/flag_util.h"
 #include "seika/utils/logger.h"
 #include "seika/utils/se_assert.h"
 
@@ -125,7 +126,7 @@ void ska_ecs_system_register(SkaECSSystem* system) {
 void ska_ecs_system_update_entity_signature_with_systems(SkaEntity entity) {
     const SkaComponentType entityComponentSignature = ska_ecs_component_manager_get_component_signature(entity);
     for (size_t i = 0; i < entitySystemData.entity_systems_count; i++) {
-        if ((entityComponentSignature & entitySystemData.entity_systems[i]->component_signature) == entitySystemData.entity_systems[i]->component_signature) {
+        if (SKA_FLAG_CONTAINS(entityComponentSignature, entitySystemData.entity_systems[i]->component_signature)) {
             ska_ecs_system_insert_entity_into_system(entity, entitySystemData.entity_systems[i]);
         } else {
             ska_ecs_system_remove_entity_from_system(entity, entitySystemData.entity_systems[i]);
@@ -136,7 +137,7 @@ void ska_ecs_system_update_entity_signature_with_systems(SkaEntity entity) {
 void ska_ecs_system_event_entity_start(SkaEntity entity) {
     const SkaComponentType entityComponentSignature = ska_ecs_component_manager_get_component_signature(entity);
     for (size_t i = 0; i < entitySystemData.on_entity_start_systems_count; i++) {
-        if ((entityComponentSignature & entitySystemData.on_entity_start_systems[i]->component_signature) == entitySystemData.on_entity_start_systems[i]->component_signature) {
+        if (SKA_FLAG_CONTAINS(entityComponentSignature, entitySystemData.on_entity_start_systems[i]->component_signature)) {
             entitySystemData.on_entity_start_systems[i]->on_entity_start_func(entity);
         }
     }
@@ -147,7 +148,7 @@ void ska_ecs_system_event_entity_end(SkaEntity entity) {
     // TODO: Consider hooks for components instead of direct node component references
     const SkaComponentType entityComponentSignature = ska_ecs_component_manager_get_component_signature(entity);
     for (size_t i = 0; i < entitySystemData.on_entity_end_systems_count; i++) {
-        if ((entityComponentSignature & entitySystemData.on_entity_end_systems[i]->component_signature) == entitySystemData.on_entity_end_systems[i]->component_signature) {
+        if (SKA_FLAG_CONTAINS(entityComponentSignature, entitySystemData.on_entity_end_systems[i]->component_signature)) {
             entitySystemData.on_entity_end_systems[i]->on_entity_end_func(entity);
         }
     }
@@ -170,7 +171,7 @@ void ska_ecs_system_event_entity_entered_scene(SkaEntity entity) {
 //    }
     const SkaComponentType entityComponentSignature = ska_ecs_component_manager_get_component_signature(entity);
     for (size_t i = 0; i < entitySystemData.on_entity_entered_scene_systems_count; i++) {
-        if ((entityComponentSignature & entitySystemData.on_entity_entered_scene_systems[i]->component_signature) == entitySystemData.on_entity_entered_scene_systems[i]->component_signature) {
+        if (SKA_FLAG_CONTAINS(entityComponentSignature, entitySystemData.on_entity_entered_scene_systems[i]->component_signature)) {
             entitySystemData.on_entity_entered_scene_systems[i]->on_entity_entered_scene_func(entity);
         }
     }
diff --git a/seika/utils/flag_util.h b/seika/utils/flag_util.h
new file mode 100644
index 0000000..cf19264
--- /dev/null
+++ b/seika/utils/flag_util.h
@@ -0,0 +1,18 @@
+#pragma once
+
+// Contains flag macros...
+
+// Check if 'FLAGS' contains all the flags specified in 'REQUIRED_FLAGS'
+#define SKA_FLAG_CONTAINS(FLAGS, REQUIRED_FLAGS) (((FLAGS) & (REQUIRED_FLAGS)) == (REQUIRED_FLAGS))
+
+// Check if 'FLAGS' contains any of the flags specified in 'REQUIRED_FLAGS'
+#define HAS_ANY_FLAG(FLAGS, REQUIRED_FLAGS) ((FLAGS) & (REQUIRED_FLAGS))
+
+// Check if 'FLAGS' contains none of the flags specified in 'FORBIDDEN_FLAGS'
+#define HAS_NO_FLAG(FLAGS, FORBIDDEN_FLAGS) (((FLAGS) & (FORBIDDEN_FLAGS)) == 0)
+
+// Check if 'FLAGS' contains exactly one of the flags specified in 'REQUIRED_FLAGS'
+#define HAS_EXACTLY_ONE_FLAG(FLAGS, REQUIRED_FLAGS) (HAS_ALL_FLAGS(FLAGS, REQUIRED_FLAGS) && ((FLAGS) != 0))
+
+// Check if 'FLAGS' contains none of the flags specified in 'REQUIRED_FLAGS'
+#define HAS_NONE_OF_FLAGS(FLAGS, REQUIRED_FLAGS) (((FLAGS) & (REQUIRED_FLAGS)) == 0)
diff --git a/vcpkg.json b/vcpkg.json
index 2532d70..16afc3c 100644
--- a/vcpkg.json
+++ b/vcpkg.json
@@ -1,6 +1,6 @@
 {
   "name": "seika",
-  "version": "0.0.29",
+  "version": "0.0.30",
   "dependencies": [
     {
       "name": "sdl2",