diff --git a/src/lib/turtle/InvManager.hx b/src/lib/turtle/InvManager.hx
index f89bd88..8d19f14 100644
--- a/src/lib/turtle/InvManager.hx
+++ b/src/lib/turtle/InvManager.hx
@@ -9,123 +9,28 @@ import kernel.turtle.Turtle;
 using Lambda;
 using tink.CoreApi;
 
-typedef InvState = Map<TurtleSlot, {count:Int, name:Item, max:Int}>;
-
 /**
 	A wrapper for the native turtle inventory functions. Adds usefullt helper functions.
 **/
 class InvManager {
-	public function new() {}
-
-	private static function getInvState() {
-		var invState:InvState = new Map();
-		for (i in 0...Turtle.MAX_SLOTS) {
-			var detail = Turtle.getItemDetail(i);
-			var spaceLeft = Turtle.getItemSpace(i);
-
-			switch detail {
-				case Some(v):
-					invState.set(i, {
-						count: v.count,
-						name: v.name,
-						max: spaceLeft + v.count
-					});
-				case None:
-					invState.remove(i);
-			}
-		}
-		return invState;
-	}
-
-	public static function getItemCountInfo():Map<Item, Int> {
-		var invState = getInvState();
-		var rtn:Map<Item, Int> = new Map();
-
-		for (slot in invState) {
-			if (!rtn.exists(slot.name)) {
-				rtn.set(slot.name, slot.count);
-				continue;
-			}
-
-			var count = rtn.get(slot.name);
-			rtn.set(slot.name, count + slot.count);
-		}
-
-		return rtn;
-	}
-
-	private static function getSlotWithMinCountForItem(item:Item, invState:InvState):Null<TurtleSlot> {
-		var min:Int = 99; // TODO: is there something like MAX_INT ???
-		var minSlot:TurtleSlot = -1;
-
-		for (k => slot in invState) {
-			if (slot.name != item) {
-				continue;
-			}
-
-			if (slot.count < min) {
-				min = slot.count;
-				minSlot = k;
-			}
-		};
-
-		return minSlot == -1 ? null : minSlot;
-	}
-
 	public static function place(item:Item, dir:InteractDirections):Outcome<Noise, String> {
-		var invState = getInvState();
-		var slot = getSlotWithMinCountForItem(item, invState);
+		var invState = new InvState();
+		var slot = invState.getSlotWithMinCountForItem(item);
 		if (slot == null) {
 			return Failure("Item not in inventory");
 		}
 
-		return placeSlot(slot, dir);
-	}
-
-	private static function placeSlot(slot:TurtleSlot, dir:InteractDirections):Outcome<Noise, String> {
-		Turtle.selectSlot(slot); // TODO: handle error
+		Turtle.selectSlot(slot);
 		return Turtle.place(dir);
 	}
 
-	private static function getSlotsForItems(invState:InvState):Map<Item, Array<TurtleSlot>> {
-		var rtn:Map<Item, Array<TurtleSlot>> = new Map();
-
-		for (k => slot in invState) {
-			if (!rtn.exists(slot.name)) {
-				rtn.set(slot.name, [k]);
-				continue;
-			}
-
-			var value = rtn.get(slot.name);
-			value.push(k);
-			rtn.set(slot.name, value);
-		}
-
-		return rtn;
-	}
-
-	/**
-		Returns the first slot that contains this item.
-	**/
-	public static function findItemSlot(item:Item):Null<TurtleSlot> {
-		var invState = getInvState();
-
-		for (k => slot in invState) {
-			if (slot.name == item) {
-				return k;
-			}
-		}
-
-		return null;
-	}
-
 	/**
 		Cleans up turtle inventory. Moves items together.
 		This should be run in a turtle thread.
 	**/
 	public static function defrag() {
-		var invState = getInvState();
-		var items = getSlotsForItems(invState);
+		var invState = new InvState();
+		var items = invState.getSlotsForItems();
 
 		for (item in items) {
 			defragItem(invState, item);
@@ -198,7 +103,8 @@ class InvManager {
 	}
 
 	public static function equipTool(item:Item, side:ToolSide):Outcome<TurtleSlot, String> {
-		var toolSlot = findItemSlot(item);
+		var invState = new InvState();
+		var toolSlot = invState.findItemSlot(item);
 
 		if (toolSlot == null) {
 			return Failure("Item not found");
diff --git a/src/lib/turtle/InvState.hx b/src/lib/turtle/InvState.hx
new file mode 100644
index 0000000..8beb6a1
--- /dev/null
+++ b/src/lib/turtle/InvState.hx
@@ -0,0 +1,99 @@
+package lib.turtle;
+
+import kernel.turtle.Turtle;
+import kernel.turtle.TurtleSlot;
+
+@:forward(get, set, iterator, keyValueIterator)
+abstract InvState(Map<TurtleSlot, {count:Int, name:Item, max:Int}>) {
+	public function new() {
+		this = new Map();
+		for (i in 0...Turtle.MAX_SLOTS) {
+			var detail = Turtle.getItemDetail(i);
+			var spaceLeft = Turtle.getItemSpace(i);
+
+			switch detail {
+				case Some(v):
+					this.set(i, {
+						count: v.count,
+						name: v.name,
+						max: spaceLeft + v.count
+					});
+				case None:
+					this.remove(i);
+			}
+		}
+	}
+
+	/**
+		Count items.
+	**/
+	public function getItemCountInfo():Map<Item, Int> {
+		var rtn:Map<Item, Int> = new Map();
+
+		for (slot in this) {
+			if (!rtn.exists(slot.name)) {
+				rtn.set(slot.name, slot.count);
+				continue;
+			}
+
+			var count = rtn.get(slot.name);
+			rtn.set(slot.name, count + slot.count);
+		}
+
+		return rtn;
+	}
+
+	/**
+		Return the slot with with the minimal count for an item.
+	**/
+	public function getSlotWithMinCountForItem(item:Item):Null<TurtleSlot> {
+		var min:Int = 99; // TODO: is there something like MAX_INT ???
+		var minSlot:TurtleSlot = -1;
+
+		for (k => slot in this) {
+			if (slot.name != item) {
+				continue;
+			}
+
+			if (slot.count < min) {
+				min = slot.count;
+				minSlot = k;
+			}
+		};
+
+		return minSlot == -1 ? null : minSlot;
+	}
+
+	/**
+		Get all slots for an Item.
+	**/
+	public function getSlotsForItems():Map<Item, Array<TurtleSlot>> {
+		var rtn:Map<Item, Array<TurtleSlot>> = new Map();
+
+		for (k => slot in this) {
+			if (!rtn.exists(slot.name)) {
+				rtn.set(slot.name, [k]);
+				continue;
+			}
+
+			var value = rtn.get(slot.name);
+			value.push(k);
+			rtn.set(slot.name, value);
+		}
+
+		return rtn;
+	}
+
+	/**
+		Returns the first slot that contains this item.
+	**/
+	public function findItemSlot(item:Item):Null<TurtleSlot> {
+		for (k => slot in this) {
+			if (slot.name == item) {
+				return k;
+			}
+		}
+
+		return null;
+	}
+}