diff --git a/WarehouseProduct.cs b/WarehouseProduct.cs
index 0b1a95c..d1c137e 100644
--- a/WarehouseProduct.cs
+++ b/WarehouseProduct.cs
@@ -4,16 +4,12 @@
 
 namespace EventSourcing.Demo.Slim
 {
-    public class WarehouseProductState
-    {
-        public int QuantityOnHand { get; set; }
-    }
-
     public class WarehouseProduct
     {
         private readonly string _sku;
         private readonly List<IEvent> _uncommittedEvents = new();
-        private readonly WarehouseProductState _warehouseProductState = new();
+
+        private int _quantityOnHand = 0;
 
         public WarehouseProduct(string sku)
         {
@@ -22,22 +18,32 @@
 
         public void ShipProduct(int quantity)
         {
-            if (quantity > _warehouseProductState.QuantityOnHand)
+            if (quantity > _quantityOnHand)
             {
                 throw new InvalidDomainException("Ah... we don't have enough product to ship?");
             }
 
             AddEvent(new ProductShipped(_sku, quantity, DateTime.UtcNow));
         }
+        
+        private void Apply(ProductShipped evnt)
+        {
+            _quantityOnHand -= evnt.Quantity;
+        }
 
         public void ReceiveProduct(int quantity)
         {
             AddEvent(new ProductReceived(_sku, quantity, DateTime.UtcNow));
         }
+        
+        private void Apply(ProductReceived evnt)
+        {
+            _quantityOnHand += evnt.Quantity;
+        }
 
         public void AdjustInventory(int quantity, string reason)
         {
-            if (_warehouseProductState.QuantityOnHand + quantity < 0)
+            if (_quantityOnHand + quantity < 0)
             {
                 throw new InvalidDomainException("Cannot adjust to a negative quantity on hand.");
             }
@@ -45,19 +51,9 @@
             AddEvent(new InventoryAdjusted(_sku, quantity, reason, DateTime.UtcNow));
         }
 
-        private void Apply(ProductShipped evnt)
-        {
-            _warehouseProductState.QuantityOnHand -= evnt.Quantity;
-        }
-
-        private void Apply(ProductReceived evnt)
-        {
-            _warehouseProductState.QuantityOnHand += evnt.Quantity;
-        }
-
         private void Apply(InventoryAdjusted evnt)
         {
-            _warehouseProductState.QuantityOnHand += evnt.Quantity;
+            _quantityOnHand += evnt.Quantity;
         }
 
         public void ApplyEvent(IEvent evnt)