diff --git a/NHSE.Core/Structures/Item/FieldItem/FieldItem.cs b/NHSE.Core/Structures/Item/FieldItem/FieldItem.cs
index dbbd8b9..eaf3d2e 100644
--- a/NHSE.Core/Structures/Item/FieldItem/FieldItem.cs
+++ b/NHSE.Core/Structures/Item/FieldItem/FieldItem.cs
@@ -5,7 +5,7 @@
 namespace NHSE.Core
 {
     [StructLayout(LayoutKind.Explicit, Size = SIZE, Pack = 1)]
-    public class FieldItem
+    public class FieldItem : IHeldItem
     {
         public const ushort EXTENSION = 0xFFFD;
         public const ushort NONE = 0xFFFE;
@@ -63,7 +63,7 @@ public void Delete()
             Count = UseCount = 0;
         }
 
-        public void CopyFrom(Item item)
+        public void CopyFrom(IHeldItem item)
         {
             ItemId = item.ItemId;
             Flags0 = item.Flags0;
diff --git a/NHSE.Core/Structures/Item/IHeldItem.cs b/NHSE.Core/Structures/Item/IHeldItem.cs
new file mode 100644
index 0000000..e8934eb
--- /dev/null
+++ b/NHSE.Core/Structures/Item/IHeldItem.cs
@@ -0,0 +1,11 @@
+namespace NHSE.Core
+{
+    public interface IHeldItem
+    {
+        ushort ItemId { get; set; }
+        byte Flags0 { get; set; }
+        byte Flags1 { get; set; }
+        ushort Count { get; set; }
+        ushort UseCount { get; set; }
+    }
+}
diff --git a/NHSE.Core/Structures/Item/Item.cs b/NHSE.Core/Structures/Item/Item.cs
index 15ec58f..a0696a8 100644
--- a/NHSE.Core/Structures/Item/Item.cs
+++ b/NHSE.Core/Structures/Item/Item.cs
@@ -3,8 +3,8 @@
 
 namespace NHSE.Core
 {
-    [StructLayout(LayoutKind.Sequential)]
-    public class Item
+    [StructLayout(LayoutKind.Explicit, Size = SIZE, Pack = 1)]
+    public class Item : IHeldItem
     {
         public static readonly Item NO_ITEM = new Item {ItemId = NONE};
         public const ushort NONE = 0xFFFE;
@@ -16,11 +16,11 @@ public class Item
             0x1E1B, 0x1E1C, 0x1E1D, 0x1E1E, 0x1E1F, 0x1E20, 0x1E21, 0x1E22
         };
 
-        public ushort ItemId;
-        public byte Flags0;
-        public byte Flags1;
-        public ushort Count;
-        public ushort UseCount;
+        [field: FieldOffset(0)] public ushort ItemId { get; set; }
+        [field: FieldOffset(2)] public byte Flags0 { get; set; }
+        [field: FieldOffset(3)] public byte Flags1 { get; set; }
+        [field: FieldOffset(4)] public ushort Count { get; set; }
+        [field: FieldOffset(6)] public ushort UseCount { get; set; }
 
         public ItemType Type => (ItemType) (Flags1 & 3);
         public int ReservedIndex => (Flags1 >> 2) & 0xF;
diff --git a/NHSE.Core/Structures/Item/ItemInfo.cs b/NHSE.Core/Structures/Item/ItemInfo.cs
index 3ac42f2..c12e994 100644
--- a/NHSE.Core/Structures/Item/ItemInfo.cs
+++ b/NHSE.Core/Structures/Item/ItemInfo.cs
@@ -4,7 +4,7 @@ public static class ItemInfo
     {
         private static readonly byte[] ItemKinds = ResourceUtil.GetBinaryResource("item_kind.bin");
 
-        public static ItemKind GetItemKind(Item item) => GetItemKind(item.ItemId);
+        public static ItemKind GetItemKind(IHeldItem item) => GetItemKind(item.ItemId);
         public static ItemKind GetItemKind(FieldItem item) => GetItemKind(item.DisplayItemId);
 
         public static ItemKind GetItemKind(ushort id)