diff --git a/src/inventory/BaseInventory.php b/src/inventory/BaseInventory.php
index 5e2ed288cc..c8e4f5db4d 100644
--- a/src/inventory/BaseInventory.php
+++ b/src/inventory/BaseInventory.php
@@ -30,11 +30,10 @@ use pocketmine\utils\ObjectSet;
 use function array_map;
 use function array_slice;
 use function count;
-use function max;
-use function min;
 use function spl_object_id;
 
 abstract class BaseInventory implements Inventory{
+	use InventoryHelpersTrait;
 
 	/** @var int */
 	protected $maxStackSize = Inventory::MAX_STACK;
@@ -140,202 +139,6 @@ abstract class BaseInventory implements Inventory{
 		$this->onSlotChange($index, $oldItem);
 	}
 
-	public function contains(Item $item) : bool{
-		$count = max(1, $item->getCount());
-		$checkDamage = !$item->hasAnyDamageValue();
-		$checkTags = $item->hasNamedTag();
-		foreach($this->getContents() as $i){
-			if($item->equals($i, $checkDamage, $checkTags)){
-				$count -= $i->getCount();
-				if($count <= 0){
-					return true;
-				}
-			}
-		}
-
-		return false;
-	}
-
-	public function all(Item $item) : array{
-		$slots = [];
-		$checkDamage = !$item->hasAnyDamageValue();
-		$checkTags = $item->hasNamedTag();
-		foreach($this->getContents() as $index => $i){
-			if($item->equals($i, $checkDamage, $checkTags)){
-				$slots[$index] = $i;
-			}
-		}
-
-		return $slots;
-	}
-
-	public function remove(Item $item) : void{
-		$checkDamage = !$item->hasAnyDamageValue();
-		$checkTags = $item->hasNamedTag();
-
-		foreach($this->getContents() as $index => $i){
-			if($item->equals($i, $checkDamage, $checkTags)){
-				$this->clear($index);
-			}
-		}
-	}
-
-	public function first(Item $item, bool $exact = false) : int{
-		$count = $exact ? $item->getCount() : max(1, $item->getCount());
-		$checkDamage = $exact || !$item->hasAnyDamageValue();
-		$checkTags = $exact || $item->hasNamedTag();
-
-		foreach($this->getContents() as $index => $i){
-			if($item->equals($i, $checkDamage, $checkTags) and ($i->getCount() === $count or (!$exact and $i->getCount() > $count))){
-				return $index;
-			}
-		}
-
-		return -1;
-	}
-
-	public function firstEmpty() : int{
-		foreach($this->slots as $i => $slot){
-			if($slot === null or $slot->isNull()){
-				return $i;
-			}
-		}
-
-		return -1;
-	}
-
-	public function isSlotEmpty(int $index) : bool{
-		return $this->slots[$index] === null or $this->slots[$index]->isNull();
-	}
-
-	public function canAddItem(Item $item) : bool{
-		$count = $item->getCount();
-		for($i = 0, $size = $this->getSize(); $i < $size; ++$i){
-			$slot = $this->getItem($i);
-			if($item->equals($slot)){
-				if(($diff = min($slot->getMaxStackSize(), $item->getMaxStackSize()) - $slot->getCount()) > 0){
-					$count -= $diff;
-				}
-			}elseif($slot->isNull()){
-				$count -= min($this->getMaxStackSize(), $item->getMaxStackSize());
-			}
-
-			if($count <= 0){
-				return true;
-			}
-		}
-
-		return false;
-	}
-
-	public function addItem(Item ...$slots) : array{
-		/** @var Item[] $itemSlots */
-		/** @var Item[] $slots */
-		$itemSlots = [];
-		foreach($slots as $slot){
-			if(!$slot->isNull()){
-				$itemSlots[] = clone $slot;
-			}
-		}
-
-		$emptySlots = [];
-
-		for($i = 0, $size = $this->getSize(); $i < $size; ++$i){
-			$item = $this->getItem($i);
-			if($item->isNull()){
-				$emptySlots[] = $i;
-			}
-
-			foreach($itemSlots as $index => $slot){
-				if($slot->equals($item) and $item->getCount() < $item->getMaxStackSize()){
-					$amount = min($item->getMaxStackSize() - $item->getCount(), $slot->getCount(), $this->getMaxStackSize());
-					if($amount > 0){
-						$slot->setCount($slot->getCount() - $amount);
-						$item->setCount($item->getCount() + $amount);
-						$this->setItem($i, $item);
-						if($slot->getCount() <= 0){
-							unset($itemSlots[$index]);
-						}
-					}
-				}
-			}
-
-			if(count($itemSlots) === 0){
-				break;
-			}
-		}
-
-		if(count($itemSlots) > 0 and count($emptySlots) > 0){
-			foreach($emptySlots as $slotIndex){
-				//This loop only gets the first item, then goes to the next empty slot
-				foreach($itemSlots as $index => $slot){
-					$amount = min($slot->getMaxStackSize(), $slot->getCount(), $this->getMaxStackSize());
-					$slot->setCount($slot->getCount() - $amount);
-					$item = clone $slot;
-					$item->setCount($amount);
-					$this->setItem($slotIndex, $item);
-					if($slot->getCount() <= 0){
-						unset($itemSlots[$index]);
-					}
-					break;
-				}
-			}
-		}
-
-		return $itemSlots;
-	}
-
-	public function removeItem(Item ...$slots) : array{
-		/** @var Item[] $itemSlots */
-		/** @var Item[] $slots */
-		$itemSlots = [];
-		foreach($slots as $slot){
-			if(!$slot->isNull()){
-				$itemSlots[] = clone $slot;
-			}
-		}
-
-		for($i = 0, $size = $this->getSize(); $i < $size; ++$i){
-			$item = $this->getItem($i);
-			if($item->isNull()){
-				continue;
-			}
-
-			foreach($itemSlots as $index => $slot){
-				if($slot->equals($item, !$slot->hasAnyDamageValue(), $slot->hasNamedTag())){
-					$amount = min($item->getCount(), $slot->getCount());
-					$slot->setCount($slot->getCount() - $amount);
-					$item->setCount($item->getCount() - $amount);
-					$this->setItem($i, $item);
-					if($slot->getCount() <= 0){
-						unset($itemSlots[$index]);
-					}
-				}
-			}
-
-			if(count($itemSlots) === 0){
-				break;
-			}
-		}
-
-		return $itemSlots;
-	}
-
-	public function clear(int $index) : void{
-		$this->setItem($index, ItemFactory::air());
-	}
-
-	public function clearAll() : void{
-		$this->setContents([]);
-	}
-
-	public function swap(int $slot1, int $slot2) : void{
-		$i1 = $this->getItem($slot1);
-		$i2 = $this->getItem($slot2);
-		$this->setItem($slot1, $i2);
-		$this->setItem($slot2, $i1);
-	}
-
 	/**
 	 * @return Player[]
 	 */
diff --git a/src/inventory/InventoryHelpersTrait.php b/src/inventory/InventoryHelpersTrait.php
new file mode 100644
index 0000000000..828a817e85
--- /dev/null
+++ b/src/inventory/InventoryHelpersTrait.php
@@ -0,0 +1,244 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+*/
+
+declare(strict_types=1);
+
+namespace pocketmine\inventory;
+
+use pocketmine\item\Item;
+use pocketmine\item\ItemFactory;
+use function count;
+use function max;
+use function min;
+
+trait InventoryHelpersTrait{
+
+	abstract public function getMaxStackSize() : int;
+	abstract public function getSize() : int;
+	abstract public function getItem(int $index) : Item;
+	abstract public function setItem(int $index, Item $item) : void;
+
+	/**
+	 * @return Item[]
+	 */
+	abstract public function getContents(bool $includeEmpty = false) : array;
+
+	/**
+	 * @param Item[] $items
+	 */
+	abstract public function setContents(array $items) : void;
+
+	public function contains(Item $item) : bool{
+		$count = max(1, $item->getCount());
+		$checkDamage = !$item->hasAnyDamageValue();
+		$checkTags = $item->hasNamedTag();
+		foreach($this->getContents() as $i){
+			if($item->equals($i, $checkDamage, $checkTags)){
+				$count -= $i->getCount();
+				if($count <= 0){
+					return true;
+				}
+			}
+		}
+
+		return false;
+	}
+
+	public function all(Item $item) : array{
+		$slots = [];
+		$checkDamage = !$item->hasAnyDamageValue();
+		$checkTags = $item->hasNamedTag();
+		foreach($this->getContents() as $index => $i){
+			if($item->equals($i, $checkDamage, $checkTags)){
+				$slots[$index] = $i;
+			}
+		}
+
+		return $slots;
+	}
+
+	public function remove(Item $item) : void{
+		$checkDamage = !$item->hasAnyDamageValue();
+		$checkTags = $item->hasNamedTag();
+
+		foreach($this->getContents() as $index => $i){
+			if($item->equals($i, $checkDamage, $checkTags)){
+				$this->clear($index);
+			}
+		}
+	}
+
+	public function first(Item $item, bool $exact = false) : int{
+		$count = $exact ? $item->getCount() : max(1, $item->getCount());
+		$checkDamage = $exact || !$item->hasAnyDamageValue();
+		$checkTags = $exact || $item->hasNamedTag();
+
+		foreach($this->getContents() as $index => $i){
+			if($item->equals($i, $checkDamage, $checkTags) and ($i->getCount() === $count or (!$exact and $i->getCount() > $count))){
+				return $index;
+			}
+		}
+
+		return -1;
+	}
+
+	public function firstEmpty() : int{
+		foreach($this->getContents(true) as $i => $slot){
+			if($slot === null or $slot->isNull()){
+				return $i;
+			}
+		}
+
+		return -1;
+	}
+
+	public function isSlotEmpty(int $index) : bool{
+		return $this->getItem($index)->isNull();
+	}
+
+	public function canAddItem(Item $item) : bool{
+		$count = $item->getCount();
+		for($i = 0, $size = $this->getSize(); $i < $size; ++$i){
+			$slot = $this->getItem($i);
+			if($item->equals($slot)){
+				if(($diff = min($slot->getMaxStackSize(), $item->getMaxStackSize()) - $slot->getCount()) > 0){
+					$count -= $diff;
+				}
+			}elseif($slot->isNull()){
+				$count -= min($this->getMaxStackSize(), $item->getMaxStackSize());
+			}
+
+			if($count <= 0){
+				return true;
+			}
+		}
+
+		return false;
+	}
+
+	public function addItem(Item ...$slots) : array{
+		/** @var Item[] $itemSlots */
+		/** @var Item[] $slots */
+		$itemSlots = [];
+		foreach($slots as $slot){
+			if(!$slot->isNull()){
+				$itemSlots[] = clone $slot;
+			}
+		}
+
+		$emptySlots = [];
+
+		for($i = 0, $size = $this->getSize(); $i < $size; ++$i){
+			$item = $this->getItem($i);
+			if($item->isNull()){
+				$emptySlots[] = $i;
+			}
+
+			foreach($itemSlots as $index => $slot){
+				if($slot->equals($item) and $item->getCount() < $item->getMaxStackSize()){
+					$amount = min($item->getMaxStackSize() - $item->getCount(), $slot->getCount(), $this->getMaxStackSize());
+					if($amount > 0){
+						$slot->setCount($slot->getCount() - $amount);
+						$item->setCount($item->getCount() + $amount);
+						$this->setItem($i, $item);
+						if($slot->getCount() <= 0){
+							unset($itemSlots[$index]);
+						}
+					}
+				}
+			}
+
+			if(count($itemSlots) === 0){
+				break;
+			}
+		}
+
+		if(count($itemSlots) > 0 and count($emptySlots) > 0){
+			foreach($emptySlots as $slotIndex){
+				//This loop only gets the first item, then goes to the next empty slot
+				foreach($itemSlots as $index => $slot){
+					$amount = min($slot->getMaxStackSize(), $slot->getCount(), $this->getMaxStackSize());
+					$slot->setCount($slot->getCount() - $amount);
+					$item = clone $slot;
+					$item->setCount($amount);
+					$this->setItem($slotIndex, $item);
+					if($slot->getCount() <= 0){
+						unset($itemSlots[$index]);
+					}
+					break;
+				}
+			}
+		}
+
+		return $itemSlots;
+	}
+
+	public function removeItem(Item ...$slots) : array{
+		/** @var Item[] $itemSlots */
+		/** @var Item[] $slots */
+		$itemSlots = [];
+		foreach($slots as $slot){
+			if(!$slot->isNull()){
+				$itemSlots[] = clone $slot;
+			}
+		}
+
+		for($i = 0, $size = $this->getSize(); $i < $size; ++$i){
+			$item = $this->getItem($i);
+			if($item->isNull()){
+				continue;
+			}
+
+			foreach($itemSlots as $index => $slot){
+				if($slot->equals($item, !$slot->hasAnyDamageValue(), $slot->hasNamedTag())){
+					$amount = min($item->getCount(), $slot->getCount());
+					$slot->setCount($slot->getCount() - $amount);
+					$item->setCount($item->getCount() - $amount);
+					$this->setItem($i, $item);
+					if($slot->getCount() <= 0){
+						unset($itemSlots[$index]);
+					}
+				}
+			}
+
+			if(count($itemSlots) === 0){
+				break;
+			}
+		}
+
+		return $itemSlots;
+	}
+
+	public function clear(int $index) : void{
+		$this->setItem($index, ItemFactory::air());
+	}
+
+	public function clearAll() : void{
+		$this->setContents([]);
+	}
+
+	public function swap(int $slot1, int $slot2) : void{
+		$i1 = $this->getItem($slot1);
+		$i2 = $this->getItem($slot2);
+		$this->setItem($slot1, $i2);
+		$this->setItem($slot2, $i1);
+	}
+}