diff --git a/scripts/item/itemStacks/PacksackStack.cs b/scripts/item/itemStacks/PacksackStack.cs
index b3ff671..a70a22e 100644
--- a/scripts/item/itemStacks/PacksackStack.cs
+++ b/scripts/item/itemStacks/PacksackStack.cs
@@ -4,7 +4,6 @@ using Godot;
 
 namespace ColdMint.scripts.item.itemStacks;
 
-
 /// <summary>
 /// <para>ItemStack for <see cref="Packsack"/> item. Can add items into pack by stack them to this stack.</para>
 /// <para>用于<see cref="Packsack"/>物品的堆栈。可以将物品堆叠到此堆栈中，从而将物品添加到背包中。</para>
@@ -19,13 +18,30 @@ public class PacksackStack(Packsack packsack) : IItemStack
     public string Name => packsack.Name;
     public string? Description => packsack.Description;
 
-    public bool CanAddItem(IItem item) => packsack.ItemContainer?.CanAddItem(item) ?? false;
+    //todo: 只拒绝是背包的物品是权宜之计，应该为物品加入一个“是否可以放入背包”的属性来实现这个判断。
+    public bool CanAddItem(IItem item)
+    {
+        if (item is Packsack) return false;
+        return packsack.ItemContainer?.CanAddItem(item) ?? false;
+    }
 
-    public bool AddItem(IItem item) => packsack.ItemContainer?.AddItem(item) ?? false;
+    public bool AddItem(IItem item)
+    {
+        if (item is Packsack) return false;
+        return packsack.ItemContainer?.AddItem(item) ?? false;
+    }
 
-    public int CanTakeFrom(IItemStack itemStack) => packsack.ItemContainer?.CanAddItemStack(itemStack) ?? 0;
+    public int CanTakeFrom(IItemStack itemStack)
+    {
+        if (itemStack.GetItem() is Packsack) return 0;
+        return packsack.ItemContainer?.CanAddItemStack(itemStack) ?? 0;
+    }
 
-    public bool TakeFrom(IItemStack itemStack) => packsack.ItemContainer?.AddItemStack(itemStack) ?? false;
+    public bool TakeFrom(IItemStack itemStack)
+    {
+        if (itemStack.GetItem() is Packsack) return false;
+        return packsack.ItemContainer?.AddItemStack(itemStack) ?? false;
+    }
 
     public IItem? GetItem()
     {