diff --git a/Minepacks-API/src/at/pcgamingfreaks/Minepacks/Bukkit/API/Backpack.java b/Minepacks-API/src/at/pcgamingfreaks/Minepacks/Bukkit/API/Backpack.java
index 765ac03..13ad475 100644
--- a/Minepacks-API/src/at/pcgamingfreaks/Minepacks/Bukkit/API/Backpack.java
+++ b/Minepacks-API/src/at/pcgamingfreaks/Minepacks/Bukkit/API/Backpack.java
@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2019 GeorgH93
+ *   Copyright (C) 2020 GeorgH93
  *
  *   This program is free software: you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -123,6 +123,7 @@ public interface Backpack extends InventoryHolder
 	 */
 	default @NotNull Map<Integer, ItemStack> addItems(ItemStack... itemStacks)
 	{
+		setChanged();
 		return getInventory().addItem(itemStacks);
 	}
 }
\ No newline at end of file
diff --git a/Minepacks/src/at/pcgamingfreaks/Minepacks/Bukkit/ItemsCollector.java b/Minepacks/src/at/pcgamingfreaks/Minepacks/Bukkit/ItemsCollector.java
index d567c73..4171b02 100644
--- a/Minepacks/src/at/pcgamingfreaks/Minepacks/Bukkit/ItemsCollector.java
+++ b/Minepacks/src/at/pcgamingfreaks/Minepacks/Bukkit/ItemsCollector.java
@@ -28,8 +28,8 @@
 import org.bukkit.scheduler.BukkitRunnable;
 import org.bukkit.scheduler.BukkitTask;
 
-import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 
 public class ItemsCollector extends BukkitRunnable
 {
@@ -69,7 +69,7 @@ public void run()
 						if(!item.isDead() && item.getPickupDelay() <= 0)
 						{
 							if(itemFilter != null && itemFilter.isItemBlocked(item.getItemStack())) continue;
-							HashMap<Integer, ItemStack> full = backpack.getInventory().addItem(item.getItemStack());
+							Map<Integer, ItemStack> full = backpack.addItems(item.getItemStack());
 							backpack.setChanged();
 							if(!full.isEmpty())
 							{
diff --git a/Minepacks/src/at/pcgamingfreaks/Minepacks/Bukkit/Listener/ItemShortcut.java b/Minepacks/src/at/pcgamingfreaks/Minepacks/Bukkit/Listener/ItemShortcut.java
index f2037d1..34e55cf 100644
--- a/Minepacks/src/at/pcgamingfreaks/Minepacks/Bukkit/Listener/ItemShortcut.java
+++ b/Minepacks/src/at/pcgamingfreaks/Minepacks/Bukkit/Listener/ItemShortcut.java
@@ -44,7 +44,6 @@
 import org.jetbrains.annotations.Nullable;
 
 import java.util.Iterator;
-import java.util.Map;
 import java.util.UUID;
 
 public class ItemShortcut implements Listener
@@ -178,8 +177,8 @@ public void onItemClick(InventoryClickEvent event)
 						final ItemStack stack = event.getCursor();
 						if(plugin.getItemFilter() == null || !plugin.getItemFilter().isItemBlocked(stack))
 						{
-							Map<Integer, ItemStack> full = backpack.getInventory().addItem(stack);
-							stack.setAmount((full.isEmpty()) ? 0 : full.get(0).getAmount());
+							ItemStack full = backpack.addItem(stack);
+							stack.setAmount((full == null) ? 0 : full.getAmount());
 							event.setCancelled(true);
 						}
 						else