diff --git a/Assets/PerfectWorld/Scripts/Inventory/EC_IvtrType.cs b/Assets/PerfectWorld/Scripts/Inventory/EC_IvtrType.cs
index 5e4f43354d..9064fcc8d0 100644
--- a/Assets/PerfectWorld/Scripts/Inventory/EC_IvtrType.cs
+++ b/Assets/PerfectWorld/Scripts/Inventory/EC_IvtrType.cs
@@ -59,6 +59,12 @@ namespace BrewMonster.Scripts
         public const int IVTRSIZE_BOOTHBPACK_MAX = 20; // Max booth pack for buying
         
         public const int IVTRSIZE_CLIENTCARDPACK = 32; // Client pack for general card collection
+
+        // Main bag UI (C++ DlgInventory.h: CECDLGSHOP_PACKMAX / PACKLINEMAX)
+        public const int IVTRSIZE_PACK_UI_PAGE = 32;
+        public const int IVTRSIZE_PACK_UI_LINE = 8;
+        /// <summary>Upper bound for client pack slots (server ivtr_size is byte).</summary>
+        public const int IVTRSIZE_PACK_MAX = 255;
         
         public const int NUM_NPCIVTR = 8;              // NPC inventory number
 
diff --git a/Assets/PerfectWorld/Scripts/Managers/EC_InventoryUI.cs b/Assets/PerfectWorld/Scripts/Managers/EC_InventoryUI.cs
index 590926e83f..e374f7d57e 100644
--- a/Assets/PerfectWorld/Scripts/Managers/EC_InventoryUI.cs
+++ b/Assets/PerfectWorld/Scripts/Managers/EC_InventoryUI.cs
@@ -25,6 +25,10 @@ namespace BrewMonster.Scripts.Managers
         [Header("Pack Buttons (assign in Inspector)")]
         [Tooltip("Main slot grid: shows IVTRTYPE_PACK (0) on Item tab and IVTRTYPE_TASKPACK (2) on Task tab.")]
         [SerializeField] private List<Button> inventoryPackButtons = new List<Button>();
+        [Tooltip("Parent of pack slot buttons (auto: first slot's parent). Cloned when server expands bag.")]
+        [SerializeField] private RectTransform inventorySlotContainer;
+        [Tooltip("Template for new slots (auto: first pack button).")]
+        [SerializeField] private Button inventorySlotTemplate;
         [SerializeField] private List<Button> equipmentPackButtons = new List<Button>(); // byPackage: 1
         [SerializeField] private List<Button> fashionPackButtons = new List<Button>();   // byPackage: 3
 
@@ -53,6 +57,9 @@ namespace BrewMonster.Scripts.Managers
         [Header("Stack combine — merge into another stack (C++ inventory drag-merge, assign in Inspector)")]
         [SerializeField] private Button combineStackButton;
 
+        [Header("Sort / arrange pack (C++ DlgInventory arrange)")]
+        [SerializeField] private Button sortInventoryButton;
+
         private int _splitAmount = 1;
         private int _splitMaxAmount = 1;
 
@@ -123,6 +130,7 @@ namespace BrewMonster.Scripts.Managers
         }
 
         private InventoryBagTab _bagTab = InventoryBagTab.Item;
+        private bool _inventorySlotTemplateResolved;
 
         private void Awake()
         {
@@ -131,6 +139,7 @@ namespace BrewMonster.Scripts.Managers
             WireBagTabButtons();
             WireSplitUI();
             WireCombineUI();
+            WireSortInventoryUI();
 
             //if (currentDragImage == null)
             //{
@@ -239,6 +248,60 @@ namespace BrewMonster.Scripts.Managers
             }
         }
 
+        private void WireSortInventoryUI()
+        {
+            ResolveSortInventoryButton();
+            if (sortInventoryButton != null)
+            {
+                sortInventoryButton.onClick.RemoveAllListeners();
+                sortInventoryButton.onClick.AddListener(OnSortInventoryClicked);
+            }
+        }
+
+        private void ResolveSortInventoryButton()
+        {
+            if (sortInventoryButton != null)
+                return;
+
+            var buttons = GetComponentsInChildren<Button>(true);
+            for (int i = 0; i < buttons.Length; i++)
+            {
+                var btn = buttons[i];
+                if (btn == null)
+                    continue;
+                string n = btn.name.ToLowerInvariant();
+                if (n.Contains("arrange") || n.Contains("sort") || n == "btn_arrange")
+                {
+                    sortInventoryButton = btn;
+                    break;
+                }
+            }
+        }
+
+        /// <summary>Arrange main inventory (IVTRTYPE_PACK). C++ CDlgInventory::OnCommand_arrange.</summary>
+        public void OnSortInventoryClicked()
+        {
+            if (_bagTab != InventoryBagTab.Item)
+            {
+                Debug.LogWarning("[InventoryUI] Sort pack: switch to Item tab first");
+                return;
+            }
+
+            var host = CECGameRun.Instance?.GetHostPlayer();
+            if (host == null)
+                return;
+
+            int cool = host.GetCoolTime((int)CoolTimeIndex.GP_CT_MULTI_EXCHANGE_ITEM, out _);
+            if (cool > 0)
+            {
+                EC_Game.GetGameRun()?.AddFixedMessage((int)FixedMsg.FIXMSG_CMD_INCOOLTIME);
+                return;
+            }
+
+            host.SortPack(InventoryConst.IVTRTYPE_PACK);
+            RefreshAll();
+        }
+
         private void ShowSplitPanel(bool show)
         {
             if (splitPanelRoot != null)
@@ -378,7 +441,7 @@ namespace BrewMonster.Scripts.Managers
             for (int slot = 0; slot < buttons.Count; slot++)
             {
                 var button = buttons[slot];
-                if (button == null)
+                if (button == null || !button.gameObject.activeInHierarchy)
                     continue;
 
                 // Get item at this slot
@@ -405,6 +468,9 @@ namespace BrewMonster.Scripts.Managers
         {
             lastRefreshTime = Time.time;
 
+            int requiredPackSlots = GetRequiredMainPackSlotCount();
+            EnsureInventoryPackSlotButtons(requiredPackSlots);
+
             var invItems = model.GetInventoryData(PKG_INVENTORY);
             var eqpItems = model.GetInventoryData(PKG_EQUIPMENT);
             var fshItems = model.GetInventoryData(PKG_FASHION);
@@ -423,6 +489,82 @@ namespace BrewMonster.Scripts.Managers
             UpdateCharacterInfo();
         }
 
+        /// <summary>
+        /// Match server pack size for the active bag tab (C++ CDlgInventory uses GetPack/GetTaskPack size).
+        /// </summary>
+        private int GetRequiredMainPackSlotCount()
+        {
+            var host = CECGameRun.Instance?.GetHostPlayer();
+            if (host == null)
+                return inventoryPackButtons != null ? inventoryPackButtons.Count : 0;
+
+            byte pack = _bagTab == InventoryBagTab.Item ? PKG_INVENTORY : PKG_TASK;
+            var inv = host.GetInventory(pack);
+            return inv != null ? Math.Max(0, inv.GetSize()) : 0;
+        }
+
+        /// <summary>
+        /// Grow/shrink visible slot buttons to match <see cref="EC_Inventory.GetSize"/> (PW: CHANGE_IVTR_SIZE, OWN_IVTR_DATA).
+        /// </summary>
+        private void EnsureInventoryPackSlotButtons(int requiredCount)
+        {
+            if (requiredCount < 0)
+                requiredCount = 0;
+            if (requiredCount > InventoryConst.IVTRSIZE_PACK_MAX)
+                requiredCount = InventoryConst.IVTRSIZE_PACK_MAX;
+
+            ResolveInventorySlotTemplate();
+            if (inventorySlotTemplate == null || inventorySlotContainer == null)
+                return;
+
+            if (inventoryPackButtons == null)
+                inventoryPackButtons = new List<Button>();
+
+            int prevCount = inventoryPackButtons.Count;
+            while (inventoryPackButtons.Count < requiredCount)
+            {
+                var clone = Instantiate(inventorySlotTemplate, inventorySlotContainer);
+                clone.gameObject.SetActive(true);
+                clone.name = $"item ({inventoryPackButtons.Count})";
+                inventoryPackButtons.Add(clone);
+            }
+
+            if (requiredCount > prevCount && inventorySlotContainer != null)
+                LayoutRebuilder.ForceRebuildLayoutImmediate(inventorySlotContainer);
+
+            for (int i = 0; i < inventoryPackButtons.Count; i++)
+            {
+                var btn = inventoryPackButtons[i];
+                if (btn == null)
+                    continue;
+                bool show = i < requiredCount;
+                if (btn.gameObject.activeSelf != show)
+                    btn.gameObject.SetActive(show);
+            }
+        }
+
+        private void ResolveInventorySlotTemplate()
+        {
+            if (_inventorySlotTemplateResolved)
+                return;
+            _inventorySlotTemplateResolved = true;
+
+            if (inventorySlotTemplate == null && inventoryPackButtons != null)
+            {
+                for (int i = 0; i < inventoryPackButtons.Count; i++)
+                {
+                    if (inventoryPackButtons[i] != null)
+                    {
+                        inventorySlotTemplate = inventoryPackButtons[i];
+                        break;
+                    }
+                }
+            }
+
+            if (inventorySlotContainer == null && inventorySlotTemplate != null)
+                inventorySlotContainer = inventorySlotTemplate.transform.parent as RectTransform;
+        }
+
         /// <summary>
         /// Update all configured money text components with the current amount.
         /// Call this when GET_OWN_MONEY arrives.
@@ -1079,7 +1221,7 @@ namespace BrewMonster.Scripts.Managers
                 for (int slot = 0; slot < buttons.Count; slot++)
                 {
                     var button = buttons[slot];
-                    if (button == null)
+                    if (button == null || !button.gameObject.activeInHierarchy)
                     {
                         continue;
                     }
diff --git a/Assets/PerfectWorld/Scripts/Network/CSNetwork/C2SCommand/C2SCommandFactory.cs b/Assets/PerfectWorld/Scripts/Network/CSNetwork/C2SCommand/C2SCommandFactory.cs
index 0d3f910666..859bcb5515 100644
--- a/Assets/PerfectWorld/Scripts/Network/CSNetwork/C2SCommand/C2SCommandFactory.cs
+++ b/Assets/PerfectWorld/Scripts/Network/CSNetwork/C2SCommand/C2SCommandFactory.cs
@@ -439,6 +439,25 @@ namespace CSNetwork.C2SCommand
             return SerializeCommand(CommandID.MOVE_IVTR_ITEM, cmd);
         }
 
+        /// <summary>C++ c2s_SendCmdMultiExchangeItem — pack arrange / sort (variable-length operation list).</summary>
+        public static Octets CreateMultiExchangeItem(byte location, int pairCount, int[] indexPairs)
+        {
+            if (pairCount < 1 || indexPairs == null || indexPairs.Length < pairCount * 2)
+                return null;
+
+            var octets = new Octets();
+            WriteBasicValue(octets, (ushort)CommandID.MULTI_EXCHANGE_ITEM);
+            WriteBasicValue(octets, location);
+            WriteBasicValue(octets, (byte)pairCount);
+            for (int i = 0; i < pairCount; i++)
+            {
+                WriteBasicValue(octets, (byte)indexPairs[i * 2]);
+                WriteBasicValue(octets, (byte)indexPairs[i * 2 + 1]);
+            }
+
+            return octets;
+        }
+
         public static Octets CreatePickupItem(int idItem, int tid)
         {
             var cmd = new CMD_Pickup
diff --git a/Assets/PerfectWorld/Scripts/Network/CSNetwork/GameSession.cs b/Assets/PerfectWorld/Scripts/Network/CSNetwork/GameSession.cs
index 3c7fc8a27a..6f48c4389b 100644
--- a/Assets/PerfectWorld/Scripts/Network/CSNetwork/GameSession.cs
+++ b/Assets/PerfectWorld/Scripts/Network/CSNetwork/GameSession.cs
@@ -471,6 +471,16 @@ namespace CSNetwork
             SendProtocol(gamedatasendRequest);
         }
 
+        public void RequestMultiExchangeItem(byte location, int pairCount, int[] indexPairs)
+        {
+            var data = C2SCommandFactory.CreateMultiExchangeItem(location, pairCount, indexPairs);
+            if (data == null)
+                return;
+            var gamedatasendRequest = new gamedatasend();
+            gamedatasendRequest.Data = data;
+            SendProtocol(gamedatasendRequest);
+        }
+
         public void RequestPickupItem(int idItem, int tid)
         {
             gamedatasend gamedatasendRequest = new gamedatasend();
diff --git a/Assets/PerfectWorld/Scripts/Network/UnityGameSession.cs b/Assets/PerfectWorld/Scripts/Network/UnityGameSession.cs
index 7703cb0417..2551c38c7b 100644
--- a/Assets/PerfectWorld/Scripts/Network/UnityGameSession.cs
+++ b/Assets/PerfectWorld/Scripts/Network/UnityGameSession.cs
@@ -497,6 +497,12 @@ namespace BrewMonster.Network
         {
             Instance._gameSession.RequestMoveIvtrItem(src, dest, count);
         }
+
+        public static void RequestMultiExchangeItem(byte location, int pairCount, int[] indexPairs)
+        {
+            Instance._gameSession.RequestMultiExchangeItem(location, pairCount, indexPairs);
+        }
+
         public static void LoadConfigData()
         {
             Instance._gameSession.LoadConfigData();
diff --git a/Assets/Prefabs/UI/InventoryUI.prefab b/Assets/Prefabs/UI/InventoryUI.prefab
index 05f4cc0236..4e18605df5 100644
--- a/Assets/Prefabs/UI/InventoryUI.prefab
+++ b/Assets/Prefabs/UI/InventoryUI.prefab
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diff --git a/Assets/Scripts/CECHostPlayer.Inventory.cs b/Assets/Scripts/CECHostPlayer.Inventory.cs
index 100ba408ab..7c1909a661 100644
--- a/Assets/Scripts/CECHostPlayer.Inventory.cs
+++ b/Assets/Scripts/CECHostPlayer.Inventory.cs
@@ -137,12 +137,15 @@ namespace BrewMonster
                 }
                 case CommandID.CHANGE_IVTR_SIZE:
                 {
-                    // C++: resize pack (normal inventory)
+                    // C++ EC_HostMsg.cpp: m_pPack->Resize + FIXMSG_NEW_INVENTORY_SIZE
                     if (data != null && data.Length >= 4)
                     {
                         int newSize = BitConverter.ToInt32(data, 0);
                         if (m_pPack != null)
                             m_pPack.Resize(newSize);
+
+                        EC_Game.GetGameRun()?.AddFixedMessage((int)FixedMsg.FIXMSG_NEW_INVENTORY_SIZE, newSize);
+
                         var ui = GameObject.FindFirstObjectByType<EC_InventoryUI>();
                         ui?.RefreshAll();
                     }
diff --git a/Assets/Scripts/CECHostPlayer.SortPack.cs b/Assets/Scripts/CECHostPlayer.SortPack.cs
new file mode 100644
index 0000000000..ae3371fcb3
--- /dev/null
+++ b/Assets/Scripts/CECHostPlayer.SortPack.cs
@@ -0,0 +1,208 @@
+using BrewMonster.Network;
+using BrewMonster.Scripts;
+using CSNetwork.GPDataType;
+using System.Collections.Generic;
+using static BrewMonster.Scripts.EC_Inventory;
+
+namespace BrewMonster
+{
+    public partial class CECHostPlayer
+    {
+        /// <summary>
+        /// C++ CECHostPlayer::SortPack — reorder pack via MULTI_EXCHANGE_ITEM (DlgInventory OnCommand_arrange).
+        /// </summary>
+        public void SortPack(int iPack)
+        {
+            EC_Inventory pInventory = GetPack(iPack);
+            if (pInventory == null)
+                return;
+
+            int nIvtrSize = pInventory.GetSize();
+            if (nIvtrSize <= 0)
+                return;
+
+            if (pInventory.GetEmptySlotNum() == nIvtrSize)
+                return;
+
+            for (int i = 0; i < nIvtrSize; i++)
+            {
+                var pItem = pInventory.GetItem(i, false);
+                if (pItem != null && pItem.IsFrozen())
+                    return;
+            }
+
+            for (int i = 0; i < nIvtrSize; i++)
+            {
+                var pItem = pInventory.GetItem(i, false);
+                pItem?.Freeze(true);
+            }
+
+            try
+            {
+                var vecItem = new List<int>(nIvtrSize);
+                for (int i = 0; i < nIvtrSize; i++)
+                    vecItem.Add(i);
+
+                vecItem.Sort((a, b) => ComparePackSortIndices(pInventory, a, b));
+
+                var vecExchange = new List<int>();
+                int pos = 0;
+                while (pos < nIvtrSize)
+                {
+                    int j = vecItem[pos];
+                    if (j == pos)
+                    {
+                        pos++;
+                        continue;
+                    }
+
+                    int k = vecItem[j];
+                    if (pInventory.GetItem(j, false) != null || pInventory.GetItem(k, false) != null)
+                    {
+                        vecExchange.Add(pos);
+                        vecExchange.Add(j);
+                    }
+
+                    int tmp = vecItem[pos];
+                    vecItem[pos] = vecItem[j];
+                    vecItem[j] = tmp;
+                }
+
+                if (vecExchange.Count > 0)
+                {
+                    int pairCount = vecExchange.Count / 2;
+                    for (int i = 0, j = vecExchange.Count - 1; i < j; i++, j--)
+                    {
+                        int t = vecExchange[i];
+                        vecExchange[i] = vecExchange[j];
+                        vecExchange[j] = t;
+                    }
+
+                    UnityGameSession.RequestMultiExchangeItem((byte)iPack, pairCount, vecExchange.ToArray());
+                }
+                else
+                {
+                    var pGameRun = EC_Game.GetGameRun();
+                    pGameRun?.AddChatMessage("Không cần sắp xếp kho đồ.", (int)ChatChannel.GP_CHAT_SYSTEM);
+                }
+            }
+            finally
+            {
+                for (int i = 0; i < nIvtrSize; i++)
+                {
+                    var pItem = pInventory.GetItem(i, false);
+                    pItem?.Freeze(false);
+                }
+            }
+        }
+
+        private static int ComparePackSortIndices(EC_Inventory pInventory, int index1, int index2)
+        {
+            if (DefaultPackSortLess(pInventory, index1, index2))
+                return -1;
+            if (DefaultPackSortLess(pInventory, index2, index1))
+                return 1;
+            return 0;
+        }
+
+        /// <summary>Returns true when slot <paramref name="index1"/> should appear before <paramref name="index2"/>.</summary>
+        private static bool DefaultPackSortLess(EC_Inventory pInventory, int index1, int index2)
+        {
+            if (pInventory == null)
+                return false;
+
+            EC_IvtrItem pItem1 = pInventory.GetItem(index1, false);
+            EC_IvtrItem pItem2 = pInventory.GetItem(index2, false);
+
+            if (pItem1 == null)
+                return false;
+            if (pItem2 == null)
+                return true;
+
+            int cid1 = pItem1.GetClassID();
+            int tid1 = pItem1.GetTemplateID();
+            int cid2 = pItem2.GetClassID();
+            int tid2 = pItem2.GetTemplateID();
+
+            if (cid1 != cid2)
+            {
+                int cidOrder1 = GetPackSortClassOrder(cid1);
+                int cidOrder2 = GetPackSortClassOrder(cid2);
+                if (cidOrder1 != cidOrder2)
+                    return cidOrder1 > cidOrder2;
+                return cid1 < cid2;
+            }
+
+            if (cid1 == (int)EC_IvtrItem.InventoryClassId.ICID_WEAPON)
+            {
+                if (pItem1 is CECIvtrWeapon w1 && pItem2 is CECIvtrWeapon w2)
+                {
+                    var e1 = w1.GetDBEssence();
+                    var e2 = w2.GetDBEssence();
+                    if (e1.level != e2.level)
+                        return e1.level > e2.level;
+                }
+            }
+            else if (cid1 == (int)EC_IvtrItem.InventoryClassId.ICID_ARMOR)
+            {
+                if (pItem1 is EC_IvtrArmor a1 && pItem2 is EC_IvtrArmor a2)
+                {
+                    var e1 = a1.GetDBEssence();
+                    var e2 = a2.GetDBEssence();
+                    if (e1.level != e2.level)
+                        return e1.level > e2.level;
+                }
+            }
+            else if (cid1 == (int)EC_IvtrItem.InventoryClassId.ICID_GENERALCARD)
+            {
+                if (pItem1 is EC_IvtrGeneralCard c1 && pItem2 is EC_IvtrGeneralCard c2)
+                {
+                    int t1 = c1.GetEssence().type;
+                    int t2 = c2.GetEssence().type;
+                    if (t1 != t2)
+                        return t1 < t2;
+                }
+            }
+
+            return tid1 < tid2;
+        }
+
+        private static int GetPackSortClassOrder(int cid)
+        {
+            int[] s_CIDs =
+            {
+                (int)EC_IvtrItem.InventoryClassId.ICID_WEAPON,
+                (int)EC_IvtrItem.InventoryClassId.ICID_ARROW,
+                (int)EC_IvtrItem.InventoryClassId.ICID_TOSSMAT,
+                (int)EC_IvtrItem.InventoryClassId.ICID_ARMOR,
+                (int)EC_IvtrItem.InventoryClassId.ICID_DECORATION,
+                (int)EC_IvtrItem.InventoryClassId.ICID_BIBLE,
+                (int)EC_IvtrItem.InventoryClassId.ICID_FLYSWORD,
+                (int)EC_IvtrItem.InventoryClassId.ICID_WING,
+                (int)EC_IvtrItem.InventoryClassId.ICID_GOBLIN,
+                (int)EC_IvtrItem.InventoryClassId.ICID_GOBLIN_EQUIP,
+                (int)EC_IvtrItem.InventoryClassId.ICID_FASHION,
+                (int)EC_IvtrItem.InventoryClassId.ICID_AUTOHP,
+                (int)EC_IvtrItem.InventoryClassId.ICID_AUTOMP,
+                (int)EC_IvtrItem.InventoryClassId.ICID_MEDICINE,
+                (int)EC_IvtrItem.InventoryClassId.ICID_SKILLMATTER,
+                (int)EC_IvtrItem.InventoryClassId.ICID_TARGETITEM,
+                (int)EC_IvtrItem.InventoryClassId.ICID_STONE,
+                (int)EC_IvtrItem.InventoryClassId.ICID_PETEGG,
+                (int)EC_IvtrItem.InventoryClassId.ICID_REFINETICKET,
+                (int)EC_IvtrItem.InventoryClassId.ICID_DYETICKET,
+                (int)EC_IvtrItem.InventoryClassId.ICID_GOBLIN_EXPPILL,
+                (int)EC_IvtrItem.InventoryClassId.ICID_GENERALCARD,
+                (int)EC_IvtrItem.InventoryClassId.ICID_GENERALCARD_DICE,
+            };
+
+            for (int i = 0; i < s_CIDs.Length; i++)
+            {
+                if (cid == s_CIDs[i])
+                    return s_CIDs.Length - i;
+            }
+
+            return 0;
+        }
+    }
+}
diff --git a/Assets/Scripts/CECHostPlayer.SortPack.cs.meta b/Assets/Scripts/CECHostPlayer.SortPack.cs.meta
new file mode 100644
index 0000000000..ef96f78e3a
--- /dev/null
+++ b/Assets/Scripts/CECHostPlayer.SortPack.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 22d7c6cd009100d44956b805ed093795
\ No newline at end of file