diff --git a/src/pocketmine/tile/Chest.php b/src/pocketmine/tile/Chest.php
index dc3d639cf..ee1f5709a 100644
--- a/src/pocketmine/tile/Chest.php
+++ b/src/pocketmine/tile/Chest.php
@@ -73,13 +73,6 @@ class Chest extends Spawnable implements InventoryHolder, Container, Nameable{
 		$this->saveItems();
 	}
 
-	/**
-	 * @return int
-	 */
-	public function getSize() : int{
-		return 27;
-	}
-
 	/**
 	 * @return ChestInventory|DoubleChestInventory
 	 */
diff --git a/src/pocketmine/tile/Container.php b/src/pocketmine/tile/Container.php
index f2c72a08b..fa3f37d23 100644
--- a/src/pocketmine/tile/Container.php
+++ b/src/pocketmine/tile/Container.php
@@ -29,24 +29,6 @@ use pocketmine\item\Item;
 interface Container{
 	public const TAG_ITEMS = "Items";
 
-	/**
-	 * @param int $index
-	 *
-	 * @return Item
-	 */
-	public function getItem(int $index) : Item;
-
-	/**
-	 * @param int  $index
-	 * @param Item $item
-	 */
-	public function setItem(int $index, Item $item);
-
-	/**
-	 * @return int
-	 */
-	public function getSize() : int;
-
 	/**
 	 * @return Inventory
 	 */
diff --git a/src/pocketmine/tile/ContainerTrait.php b/src/pocketmine/tile/ContainerTrait.php
index 69372df56..cf9558195 100644
--- a/src/pocketmine/tile/ContainerTrait.php
+++ b/src/pocketmine/tile/ContainerTrait.php
@@ -35,11 +35,6 @@ use pocketmine\nbt\tag\ListTag;
  */
 trait ContainerTrait{
 
-	/**
-	 * @return int
-	 */
-	abstract public function getSize() : int;
-
 	abstract public function getNBT() : CompoundTag;
 
 	/**
@@ -47,89 +42,23 @@ trait ContainerTrait{
 	 */
 	abstract public function getRealInventory();
 
-	/**
-	 * @param $index
-	 *
-	 * @return int
-	 */
-	protected function getSlotIndex(int $index) : int{
-		foreach($this->getNBT()->getListTag(Container::TAG_ITEMS) as $i => $slot){
-			/** @var CompoundTag $slot */
-			if($slot->getByte("Slot") === $index){
-				return (int) $i;
-			}
-		}
-
-		return -1;
-	}
-
-	/**
-	 * This method should not be used by plugins, use the Inventory
-	 *
-	 * @param int $index
-	 *
-	 * @return Item
-	 */
-	public function getItem(int $index) : Item{
-		$i = $this->getSlotIndex($index);
-		/** @var CompoundTag|null $itemTag */
-		$itemTag = $this->getNBT()->getListTag(Container::TAG_ITEMS)[$i] ?? null;
-		if($itemTag !== null){
-			return Item::nbtDeserialize($itemTag);
-		}
-
-		return ItemFactory::get(Item::AIR, 0, 0);
-	}
-
-	/**
-	 * This method should not be used by plugins, use the Inventory
-	 *
-	 * @param int  $index
-	 * @param Item $item
-	 */
-	public function setItem(int $index, Item $item) : void{
-		$i = $this->getSlotIndex($index);
-
-		$d = $item->nbtSerialize($index);
-
-		$items = $this->getNBT()->getListTag(Container::TAG_ITEMS);
-		assert($items instanceof ListTag);
-
-		if($item->isNull()){
-			if($i >= 0){
-				unset($items[$i]);
-			}
-		}elseif($i < 0){
-			for($i = 0; $i <= $this->getSize(); ++$i){
-				if(!isset($items[$i])){
-					break;
-				}
-			}
-			$items[$i] = $d;
-		}else{
-			$items[$i] = $d;
-		}
-
-		$this->getNBT()->setTag($items);
-	}
-
 	protected function loadItems() : void{
-		if(!$this->getNBT()->hasTag(Container::TAG_ITEMS, ListTag::class)){
-			$this->getNBT()->setTag(new ListTag(Container::TAG_ITEMS, [], NBT::TAG_Compound));
-		}
+		if($this->getNBT()->hasTag(Container::TAG_ITEMS, ListTag::class)){
+			$inventoryTag = $this->getNBT()->getListTag(Container::TAG_ITEMS);
 
-		$inventory = $this->getRealInventory();
-		for($i = 0, $size = $this->getSize(); $i < $size; ++$i){
-			$inventory->setItem($i, $this->getItem($i));
+			$inventory = $this->getRealInventory();
+			foreach($inventoryTag as $itemNBT){
+				$inventory->setItem($itemNBT->getByte("Slot"), Item::nbtDeserialize($itemNBT));
+			}
 		}
 	}
 
 	protected function saveItems() : void{
-		$this->getNBT()->setTag(new ListTag(Container::TAG_ITEMS, [], NBT::TAG_Compound));
-
-		$inventory = $this->getRealInventory();
-		for($i = 0, $size = $this->getSize(); $i < $size; ++$i){
-			$this->setItem($i, $inventory->getItem($i));
+		$items = [];
+		foreach($this->getRealInventory()->getContents() as $slot => $item){
+			$items[] = $item->nbtSerialize($slot);
 		}
+
+		$this->getNBT()->setTag(new ListTag(Container::TAG_ITEMS, $items, NBT::TAG_Compound));
 	}
 }
diff --git a/src/pocketmine/tile/Furnace.php b/src/pocketmine/tile/Furnace.php
index 8cbd0fbb5..d7aa6cc2c 100644
--- a/src/pocketmine/tile/Furnace.php
+++ b/src/pocketmine/tile/Furnace.php
@@ -104,13 +104,6 @@ class Furnace extends Spawnable implements InventoryHolder, Container, Nameable{
 		$this->saveItems();
 	}
 
-	/**
-	 * @return int
-	 */
-	public function getSize() : int{
-		return 3;
-	}
-
 	/**
 	 * @return FurnaceInventory
 	 */