diff --git a/Assets/Prefabs/MetalMine.prefab b/Assets/Prefabs/ResourceSource.prefab
similarity index 92%
rename from Assets/Prefabs/MetalMine.prefab
rename to Assets/Prefabs/ResourceSource.prefab
index a89f786..46abb93 100644
--- a/Assets/Prefabs/MetalMine.prefab
+++ b/Assets/Prefabs/ResourceSource.prefab
@@ -15,9 +15,8 @@ GameObject:
   - component: {fileID: 819912288095587636}
   - component: {fileID: 1421388845701231023}
   - component: {fileID: 4527755210678078285}
-  - component: {fileID: 7057847397855985585}
   m_Layer: 0
-  m_Name: MetalMine
+  m_Name: ResourceSource
   m_TagString: Untagged
   m_Icon: {fileID: 0}
   m_NavMeshLayer: 0
@@ -113,8 +112,11 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: c06e7972b6bac34468cda352d1c07c7a, type: 3}
   m_Name: 
   m_EditorClassIdentifier: Assembly-CSharp::ResourceSource
+  name: 
   Resource:
     rid: 7834219818361815538
+  ParentInventory: {fileID: 0}
+  InitialCapacity: 0
   references:
     version: 2
     RefIds:
@@ -218,17 +220,4 @@ MonoBehaviour:
   m_EditorClassIdentifier: Assembly-CSharp::ResourceGenerator
   Interval: 2000
   Power: 3
-  <TargetInventory>k__BackingField: {fileID: 7057847397855985585}
---- !u!114 &7057847397855985585
-MonoBehaviour:
-  m_ObjectHideFlags: 0
-  m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInstance: {fileID: 0}
-  m_PrefabAsset: {fileID: 0}
-  m_GameObject: {fileID: 558136326881420228}
-  m_Enabled: 1
-  m_EditorHideFlags: 0
-  m_Script: {fileID: 11500000, guid: b6e85c222b8627a4287c8dc63bf5cfe6, type: 3}
-  m_Name: 
-  m_EditorClassIdentifier: Assembly-CSharp::InventoryHolder
-  name: 
+  <TargetInventory>k__BackingField: {fileID: 4019719181363577730}
diff --git a/Assets/Prefabs/MetalMine.prefab.meta b/Assets/Prefabs/ResourceSource.prefab.meta
similarity index 100%
rename from Assets/Prefabs/MetalMine.prefab.meta
rename to Assets/Prefabs/ResourceSource.prefab.meta
diff --git a/Assets/Scenes/SampleScene.unity b/Assets/Scenes/SampleScene.unity
index 0b646ca..434604a 100644
--- a/Assets/Scenes/SampleScene.unity
+++ b/Assets/Scenes/SampleScene.unity
@@ -157,12 +157,20 @@ PrefabInstance:
       objectReference: {fileID: 0}
     - target: {fileID: 4019719181363577730, guid: cd4f08f126f359d48ba53df6ace98e6c, type: 3}
       propertyPath: Resource
-      value: 7834219818361815541
+      value: 7834219818361815585
       objectReference: {fileID: 0}
     - target: {fileID: 4019719181363577730, guid: cd4f08f126f359d48ba53df6ace98e6c, type: 3}
       propertyPath: resource
       value: 7834219806948065471
       objectReference: {fileID: 0}
+    - target: {fileID: 4019719181363577730, guid: cd4f08f126f359d48ba53df6ace98e6c, type: 3}
+      propertyPath: InitialCapacity
+      value: 200
+      objectReference: {fileID: 0}
+    - target: {fileID: 4019719181363577730, guid: cd4f08f126f359d48ba53df6ace98e6c, type: 3}
+      propertyPath: ParentInventory
+      value: 
+      objectReference: {fileID: 403904197}
     - target: {fileID: 4019719181363577730, guid: cd4f08f126f359d48ba53df6ace98e6c, type: 3}
       propertyPath: <Label>k__BackingField
       value: Power Plant
@@ -187,6 +195,10 @@ PrefabInstance:
       propertyPath: 'managedReferences[7834219818361815541]'
       value: Assembly-CSharp Energy
       objectReference: {fileID: 0}
+    - target: {fileID: 4019719181363577730, guid: cd4f08f126f359d48ba53df6ace98e6c, type: 3}
+      propertyPath: 'managedReferences[7834219818361815585]'
+      value: Assembly-CSharp Energy
+      objectReference: {fileID: 0}
     - target: {fileID: 4527755210678078285, guid: cd4f08f126f359d48ba53df6ace98e6c, type: 3}
       propertyPath: Power
       value: 7
@@ -247,7 +259,8 @@ PrefabInstance:
       propertyPath: name
       value: Power Plant
       objectReference: {fileID: 0}
-    m_RemovedComponents: []
+    m_RemovedComponents:
+    - {fileID: 7057847397855985585, guid: cd4f08f126f359d48ba53df6ace98e6c, type: 3}
     m_RemovedGameObjects: []
     m_AddedGameObjects: []
     m_AddedComponents: []
@@ -327,7 +340,6 @@ MonoBehaviour:
   m_Name: 
   m_EditorClassIdentifier: '::'
   name: 
-  Capacity: -1
 --- !u!114 &403904198
 MonoBehaviour:
   m_ObjectHideFlags: 0
@@ -539,12 +551,16 @@ PrefabInstance:
       objectReference: {fileID: 0}
     - target: {fileID: 4019719181363577730, guid: cd4f08f126f359d48ba53df6ace98e6c, type: 3}
       propertyPath: Resource
-      value: 7834219818361815539
+      value: 7834219818361815584
       objectReference: {fileID: 0}
     - target: {fileID: 4019719181363577730, guid: cd4f08f126f359d48ba53df6ace98e6c, type: 3}
       propertyPath: resource
       value: 7834219806948065469
       objectReference: {fileID: 0}
+    - target: {fileID: 4019719181363577730, guid: cd4f08f126f359d48ba53df6ace98e6c, type: 3}
+      propertyPath: ParentInventory
+      value: 
+      objectReference: {fileID: 403904197}
     - target: {fileID: 4019719181363577730, guid: cd4f08f126f359d48ba53df6ace98e6c, type: 3}
       propertyPath: <Label>k__BackingField
       value: Power Plant
@@ -569,6 +585,10 @@ PrefabInstance:
       propertyPath: 'managedReferences[7834219818361815539]'
       value: Assembly-CSharp Electronics
       objectReference: {fileID: 0}
+    - target: {fileID: 4019719181363577730, guid: cd4f08f126f359d48ba53df6ace98e6c, type: 3}
+      propertyPath: 'managedReferences[7834219818361815584]'
+      value: Assembly-CSharp Electronics
+      objectReference: {fileID: 0}
     - target: {fileID: 4527755210678078285, guid: cd4f08f126f359d48ba53df6ace98e6c, type: 3}
       propertyPath: Interval
       value: 0
@@ -817,12 +837,20 @@ PrefabInstance:
       objectReference: {fileID: 0}
     - target: {fileID: 4019719181363577730, guid: cd4f08f126f359d48ba53df6ace98e6c, type: 3}
       propertyPath: Resource
-      value: 7834219818361815540
+      value: 7834219818361815583
       objectReference: {fileID: 0}
     - target: {fileID: 4019719181363577730, guid: cd4f08f126f359d48ba53df6ace98e6c, type: 3}
       propertyPath: resource
       value: 7834219806948065470
       objectReference: {fileID: 0}
+    - target: {fileID: 4019719181363577730, guid: cd4f08f126f359d48ba53df6ace98e6c, type: 3}
+      propertyPath: InitialCapacity
+      value: 500
+      objectReference: {fileID: 0}
+    - target: {fileID: 4019719181363577730, guid: cd4f08f126f359d48ba53df6ace98e6c, type: 3}
+      propertyPath: ParentInventory
+      value: 
+      objectReference: {fileID: 403904197}
     - target: {fileID: 4019719181363577730, guid: cd4f08f126f359d48ba53df6ace98e6c, type: 3}
       propertyPath: <Label>k__BackingField
       value: Metal Mine
@@ -847,6 +875,10 @@ PrefabInstance:
       propertyPath: 'managedReferences[7834219818361815540]'
       value: Assembly-CSharp Metal
       objectReference: {fileID: 0}
+    - target: {fileID: 4019719181363577730, guid: cd4f08f126f359d48ba53df6ace98e6c, type: 3}
+      propertyPath: 'managedReferences[7834219818361815583]'
+      value: Assembly-CSharp Metal
+      objectReference: {fileID: 0}
     - target: {fileID: 4851214142334336292, guid: cd4f08f126f359d48ba53df6ace98e6c, type: 3}
       propertyPath: m_LocalPosition.x
       value: 0
@@ -897,7 +929,7 @@ PrefabInstance:
       objectReference: {fileID: 0}
     - target: {fileID: 7057847397855985585, guid: cd4f08f126f359d48ba53df6ace98e6c, type: 3}
       propertyPath: Capacity
-      value: 50
+      value: 500
       objectReference: {fileID: 0}
     m_RemovedComponents: []
     m_RemovedGameObjects: []
diff --git a/Assets/Scripts/Inventory.cs b/Assets/Scripts/Inventory.cs
index 4fc91d5..cae3ce6 100644
--- a/Assets/Scripts/Inventory.cs
+++ b/Assets/Scripts/Inventory.cs
@@ -9,8 +9,6 @@ public abstract class IInventory
 {
     private List<Action> changeCallbacks = new List<Action>();
 
-    public abstract string Name { get; }
-
     public abstract IReadOnlyDictionary<string, float> Items { get; }
 
     public abstract float Capacity { get; set; }
@@ -59,7 +57,7 @@ public abstract class IInventory
         changeCallbacks.Remove(callback);
     }
 
-    private void InvokeOnChange()
+    protected void InvokeOnChange()
     {
         // Debug.Log(
         //     $"Resources: {String.Join("; ", resources.Values.ToArray().Select(r => r.Resource.Name + "=" + r.Amount + (r.Unlocked ? "" : "(locked)")))}"
@@ -79,12 +77,10 @@ public abstract class IInventory
 [Serializable]
 public class Inventory2 : IInventory, IDataPersistence<InventoryData>
 {
-    private NameCallback nameCallback;
     private Dictionary<string, float> items = new Dictionary<string, float>();
 
-    public Inventory2(float capacity, NameCallback nameCallback)
+    public Inventory2(float capacity)
     {
-        this.nameCallback = nameCallback;
         _capacity = capacity;
     }
 
@@ -92,12 +88,14 @@ public class Inventory2 : IInventory, IDataPersistence<InventoryData>
 
     private float _capacity;
 
-    public override string Name => nameCallback();
-
     public override float Capacity
     {
         get { return _capacity; }
-        set { _capacity = value; }
+        set
+        {
+            _capacity = value;
+            InvokeOnChange();
+        }
     }
 
     public override string ToString()
@@ -172,7 +170,7 @@ public class Inventory2 : IInventory, IDataPersistence<InventoryData>
 
     public Inventory2 Clone()
     {
-        var clone = new Inventory2(Capacity, nameCallback);
+        var clone = new Inventory2(Capacity);
         foreach (var kvp in items)
             clone.items.Add(kvp.Key, kvp.Value);
 
diff --git a/Assets/Scripts/InventoryHolder.cs b/Assets/Scripts/InventoryHolder.cs
index 512e821..a218609 100644
--- a/Assets/Scripts/InventoryHolder.cs
+++ b/Assets/Scripts/InventoryHolder.cs
@@ -2,24 +2,12 @@ using System;
 using UnityEngine;
 
 // class, not interface so Unity shows fields in Editor
-public class InventoryHolder : MonoBehaviour
+public abstract class InventoryHolder : MonoBehaviour
 {
     [SerializeField]
     private new string name;
 
-    public readonly IInventory Inventory;
+    public abstract IInventory Inventory { get; }
 
     public string Name => name == null || name == "" ? gameObject.name : name;
-
-    public float Capacity;
-
-    public InventoryHolder()
-    {
-        Inventory = new Inventory2(0, () => Name);
-    }
-
-    void Start()
-    {
-        Inventory.Capacity = Capacity;
-    }
 }
diff --git a/Assets/Scripts/ResourceRegistry.cs b/Assets/Scripts/ResourceRegistry.cs
new file mode 100644
index 0000000..2daa69a
--- /dev/null
+++ b/Assets/Scripts/ResourceRegistry.cs
@@ -0,0 +1,33 @@
+using System.Collections.Generic;
+
+public class ResourceRegistry
+{
+    public static ResourceRegistry Instance { get; private set; }
+
+    private readonly List<Resource> _items = new List<Resource>();
+
+    public Resource[] Items => _items.ToArray();
+
+    public readonly Metal Metal = new Metal();
+    public readonly Electronics Electronics = new Electronics();
+    public readonly Energy Energy = new Energy();
+    public readonly Money Money = new Money();
+
+    static ResourceRegistry()
+    {
+        Instance = new ResourceRegistry();
+    }
+
+    private ResourceRegistry()
+    {
+        RegisterResource(Metal, true);
+        RegisterResource(Electronics, true); // TODO lock back
+        RegisterResource(Energy, true); // TODO lock back
+        RegisterResource(Money, true); // TODO lock back
+    }
+
+    private void RegisterResource(Resource resource, bool unlocked = false)
+    {
+        _items.Add(resource);
+    }
+}
diff --git a/Assets/Scripts/ResourceRegistry.cs.meta b/Assets/Scripts/ResourceRegistry.cs.meta
new file mode 100644
index 0000000..a74a336
--- /dev/null
+++ b/Assets/Scripts/ResourceRegistry.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: ab0e490a1eacfaf4791ced60ce6a934b
\ No newline at end of file
diff --git a/Assets/Scripts/ResourceSource.cs b/Assets/Scripts/ResourceSource.cs
index 51d2cf9..43467a9 100644
--- a/Assets/Scripts/ResourceSource.cs
+++ b/Assets/Scripts/ResourceSource.cs
@@ -1,8 +1,29 @@
 using System;
 using UnityEngine;
 
-public class ResourceSource : MonoBehaviour
+public class ResourceSource : InventoryHolder
 {
     [SerializeReference]
     public Resource Resource;
+
+    public InventoryHolder ParentInventory;
+
+    public float InitialCapacity;
+
+    private readonly IInventory _inventory;
+
+    public override IInventory Inventory => _inventory;
+
+    public ResourceSource()
+    {
+        _inventory = new Inventory2(InitialCapacity);
+    }
+
+    void Start()
+    {
+        _inventory.Capacity = InitialCapacity;
+
+        if (ParentInventory != null && ParentInventory.Inventory is VirtualInventory)
+            ((VirtualInventory)ParentInventory.Inventory).RegisterChild(_inventory);
+    }
 }
diff --git a/Assets/Scripts/ResourceStorage.cs b/Assets/Scripts/ResourceStorage.cs
index f1066ac..68b3264 100644
--- a/Assets/Scripts/ResourceStorage.cs
+++ b/Assets/Scripts/ResourceStorage.cs
@@ -1,45 +1,16 @@
 using System;
-using System.Collections.Generic;
 using System.Linq;
 using UnityEngine;
 using UnityEngine.UIElements;
 
-public class ResourceRegistry
-{
-    public static ResourceRegistry Instance { get; private set; }
-
-    private readonly List<Resource> _items = new List<Resource>();
-
-    public Resource[] Items => _items.ToArray();
-
-    public readonly Metal Metal = new Metal();
-    public readonly Electronics Electronics = new Electronics();
-    public readonly Energy Energy = new Energy();
-    public readonly Money Money = new Money();
-
-    static ResourceRegistry()
-    {
-        Instance = new ResourceRegistry();
-    }
-
-    private ResourceRegistry()
-    {
-        RegisterResource(Metal, true);
-        RegisterResource(Electronics, true); // TODO lock back
-        RegisterResource(Energy, true); // TODO lock back
-        RegisterResource(Money, true); // TODO lock back
-    }
-
-    private void RegisterResource(Resource resource, bool unlocked = false)
-    {
-        _items.Add(resource);
-    }
-}
-
 public class ResourceStorage : InventoryHolder
 {
+    private readonly IInventory _inventory;
+
+    public override IInventory Inventory => _inventory;
+
     public ResourceStorage()
     {
-        Capacity = -1;
+        _inventory = new VirtualInventory();
     }
 }
diff --git a/Assets/Scripts/VIrtualInventory.cs b/Assets/Scripts/VIrtualInventory.cs
new file mode 100644
index 0000000..08b9f9f
--- /dev/null
+++ b/Assets/Scripts/VIrtualInventory.cs
@@ -0,0 +1,96 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using UnityEngine;
+
+internal class ChildInventotyWithCallback
+{
+    public readonly IInventory inventory;
+    public readonly Action callback;
+
+    public ChildInventotyWithCallback(IInventory inventory, Action callback)
+    {
+        this.inventory = inventory;
+        this.callback = callback;
+    }
+}
+
+[Serializable]
+public class VirtualInventory : IInventory
+{
+    private readonly List<ChildInventotyWithCallback> _children =
+        new List<ChildInventotyWithCallback>();
+
+    public override IReadOnlyDictionary<string, float> Items
+    {
+        get
+        {
+            var items = new Dictionary<string, float>();
+
+            foreach (var child in _children)
+            {
+                foreach (var childItem in child.inventory.Items)
+                {
+                    if (!items.ContainsKey(childItem.Key))
+                        items.Add(childItem.Key, childItem.Value);
+                    else
+                        items[childItem.Key] += childItem.Value;
+                }
+            }
+
+            return items;
+        }
+    }
+
+    public override float Capacity
+    {
+        get => _children.Sum(c => c.inventory.Capacity);
+        set { throw new NotSupportedException(); }
+    }
+
+    public void RegisterChild(IInventory child)
+    {
+        Debug.Log($"Registered child {child}");
+        var reg = new ChildInventotyWithCallback(child, () => OnChildChange(child));
+        _children.Add(reg);
+        child.RegisterOnChangeCallback(reg.callback);
+    }
+
+    public void UnregisterChild(IInventory child)
+    {
+        int index = _children.FindIndex(c => c.inventory == child);
+        if (index < 0)
+            return;
+
+        child.UnregisterOnChangeCallback(_children[index].callback);
+        _children.RemoveAt(index);
+    }
+
+    private void OnChildChange(IInventory child)
+    {
+        Debug.Log($"child has changed {child}");
+        base.InvokeOnChange();
+    }
+
+    public override float GetAmount(string item)
+    {
+        float amount = 0;
+        Items.TryGetValue(item, out amount);
+        return amount;
+    }
+
+    protected override float DoAdd(string item, float amount, bool allowPartialAdd = false)
+    {
+        throw new NotSupportedException();
+    }
+
+    protected override int DoClear()
+    {
+        throw new NotSupportedException();
+    }
+
+    protected override float DoRemove(string item, float amount, bool allowPartialRemoval = false)
+    {
+        throw new NotSupportedException();
+    }
+}
diff --git a/Assets/Scripts/VIrtualInventory.cs.meta b/Assets/Scripts/VIrtualInventory.cs.meta
new file mode 100644
index 0000000..725bba5
--- /dev/null
+++ b/Assets/Scripts/VIrtualInventory.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: fdbf256004ee20a45be934c4508a24c7
\ No newline at end of file