diff --git a/SDK/include/NDK/BaseSystem.hpp b/SDK/include/NDK/BaseSystem.hpp
index a323f2952..99dcbf768 100644
--- a/SDK/include/NDK/BaseSystem.hpp
+++ b/SDK/include/NDK/BaseSystem.hpp
@@ -9,6 +9,7 @@
 
 #include <Nazara/Core/Bitset.hpp>
 #include <NDK/Entity.hpp>
+#include <NDK/EntityList.hpp>
 #include <vector>
 
 namespace Ndk
@@ -33,7 +34,7 @@ namespace Ndk
 
 			bool Filters(const Entity* entity) const;
 
-			inline const std::vector<EntityHandle>& GetEntities() const;
+			inline const EntityList& GetEntities() const;
 			inline SystemIndex GetIndex() const;
 			inline int GetUpdateOrder() const;
 			inline float GetUpdateRate() const;
@@ -84,12 +85,11 @@ namespace Ndk
 			static inline bool Initialize();
 			static inline void Uninitialize();
 
-			std::vector<EntityHandle> m_entities;
-			Nz::Bitset<Nz::UInt64> m_entityBits;
 			Nz::Bitset<> m_excludedComponents;
 			mutable Nz::Bitset<> m_filterResult;
 			Nz::Bitset<> m_requiredAnyComponents;
 			Nz::Bitset<> m_requiredComponents;
+			EntityList m_entities;
 			SystemIndex m_systemIndex;
 			World* m_world;
 			bool m_updateEnabled;
diff --git a/SDK/include/NDK/BaseSystem.inl b/SDK/include/NDK/BaseSystem.inl
index e949d254b..5969dd8e3 100644
--- a/SDK/include/NDK/BaseSystem.inl
+++ b/SDK/include/NDK/BaseSystem.inl
@@ -56,7 +56,7 @@ namespace Ndk
 	* \return A constant reference to the list of entities
 	*/
 
-	inline const std::vector<EntityHandle>& BaseSystem::GetEntities() const
+	inline const EntityList& BaseSystem::GetEntities() const
 	{
 		return m_entities;
 	}
@@ -121,10 +121,7 @@ namespace Ndk
 
 	inline bool BaseSystem::HasEntity(const Entity* entity) const
 	{
-		if (!entity)
-			return false;
-
-		return m_entityBits.UnboundedTest(entity->GetId());
+		return m_entities.Has(entity);
 	}
 
 	/*!
@@ -288,9 +285,7 @@ namespace Ndk
 	{
 		NazaraAssert(entity, "Invalid entity");
 
-		m_entities.emplace_back(entity);
-		m_entityBits.UnboundedSet(entity->GetId(), true);
-
+		m_entities.Insert(entity);
 		entity->RegisterSystem(m_systemIndex);
 
 		OnEntityAdded(entity);
@@ -308,14 +303,7 @@ namespace Ndk
 	{
 		NazaraAssert(entity, "Invalid entity");
 
-		auto it = std::find(m_entities.begin(), m_entities.end(), *entity);
-		NazaraAssert(it != m_entities.end(), "Entity is not part of this system");
-
-		// To avoid moving a lot of handles, we swap and pop
-		std::swap(*it, m_entities.back());
-		m_entities.pop_back(); // We get it out of the vector
-
-		m_entityBits.Reset(entity->GetId());
+		m_entities.Remove(entity);
 		entity->UnregisterSystem(m_systemIndex);
 
 		OnEntityRemoved(entity); // And we alert our callback
@@ -360,7 +348,7 @@ namespace Ndk
 	}
 
 	/*!
-	* \brief Uninitializes the BaseSystem
+	* \brief Uninitialize the BaseSystem
 	*/
 
 	inline void BaseSystem::Uninitialize()
diff --git a/SDK/include/NDK/EntityList.hpp b/SDK/include/NDK/EntityList.hpp
index 22a632e65..76097f87b 100644
--- a/SDK/include/NDK/EntityList.hpp
+++ b/SDK/include/NDK/EntityList.hpp
@@ -21,6 +21,8 @@ namespace Ndk
 			using size_type = std::size_t;
 
 			inline EntityList();
+			inline EntityList(const EntityList& entityList);
+			inline EntityList(EntityList&& entityList) noexcept;
 			~EntityList() = default;
 
 			inline void Clear();
@@ -33,11 +35,14 @@ namespace Ndk
 			inline void Remove(Entity* entity);
 
 			// STL API
-			inline iterator begin();
+			inline iterator begin() const;
 			inline bool empty() const;
-			inline iterator end();
+			inline iterator end() const;
 			inline size_type size() const;
 
+			inline EntityList& operator=(const EntityList& entityList);
+			inline EntityList& operator=(EntityList&& entityList) noexcept;
+
 		private:
 			inline std::size_t FindNext(std::size_t currentId) const;
 			inline World* GetWorld() const;
@@ -46,7 +51,7 @@ namespace Ndk
 			World* m_world;
 	};
 
-	class EntityList::iterator : public std::iterator<std::forward_iterator_tag, const EntityHandle>
+	class NDK_API EntityList::iterator : public std::iterator<std::forward_iterator_tag, const EntityHandle>
 	{
 		friend EntityList;
 
diff --git a/SDK/include/NDK/EntityList.inl b/SDK/include/NDK/EntityList.inl
index 6d9447a7f..8d639b762 100644
--- a/SDK/include/NDK/EntityList.inl
+++ b/SDK/include/NDK/EntityList.inl
@@ -16,13 +16,32 @@ namespace Ndk
 	*/
 
 	/*!
-	* \brief Clears the set from every entities
+	* \brief Construct a new entity list
 	*/
 	inline EntityList::EntityList() :
 	m_world(nullptr)
 	{
 	}
 
+	/*!
+	* \brief Construct a new entity list by copying another one
+	*/
+	inline EntityList::EntityList(const EntityList& entityList) :
+	m_entityBits(entityList.m_entityBits),
+	m_world(entityList.m_world)
+	{
+	}
+
+	/*!
+	* \brief Construct a new entity list by moving a list into this one
+	*/
+	inline EntityList::EntityList(EntityList&& entityList) noexcept :
+	m_entityBits(std::move(entityList.m_entityBits)),
+	m_world(entityList.m_world)
+	{
+	}
+
+
 	/*!
 	* \brief Clears the set from every entities
 	*
@@ -93,7 +112,7 @@ namespace Ndk
 	}
 
 	// STL Interface
-	inline EntityList::iterator EntityList::begin()
+	inline EntityList::iterator EntityList::begin() const
 	{
 		return EntityList::iterator(this, m_entityBits.FindFirst());
 	}
@@ -103,7 +122,7 @@ namespace Ndk
 		return m_entityBits.TestAny();
 	}
 
-	inline EntityList::iterator EntityList::end()
+	inline EntityList::iterator EntityList::end() const
 	{
 		return EntityList::iterator(this, m_entityBits.npos);
 	}
@@ -113,6 +132,22 @@ namespace Ndk
 		return m_entityBits.Count();
 	}
 
+	inline EntityList& EntityList::operator=(const EntityList& entityList)
+	{
+		m_entityBits = entityList.m_entityBits;
+		m_world = entityList.m_world;
+
+		return *this;
+	}
+
+	inline EntityList& EntityList::operator=(EntityList && entityList) noexcept
+	{
+		m_entityBits = std::move(entityList.m_entityBits);
+		m_world = entityList.m_world;
+
+		return *this;
+	}
+
 	inline std::size_t EntityList::FindNext(std::size_t currentId) const
 	{
 		return m_entityBits.FindNext(currentId);