diff --git a/src/main/java/net/minestom/server/inventory/PlayerInventory.java b/src/main/java/net/minestom/server/inventory/PlayerInventory.java
index c00b5cd46..8172487eb 100644
--- a/src/main/java/net/minestom/server/inventory/PlayerInventory.java
+++ b/src/main/java/net/minestom/server/inventory/PlayerInventory.java
@@ -214,8 +214,9 @@ public class PlayerInventory implements InventoryModifier, InventoryClickHandler
                 this.items[slot] = itemStack;
             }
 
-            // Refresh inventory items
-            update();
+            // Refresh slot
+            refreshSlot(slot);
+            //update(); in case of problems
 
             // Sync equipment
             if (equipmentSlot != null) {
diff --git a/src/main/java/net/minestom/server/item/ItemFlag.java b/src/main/java/net/minestom/server/item/ItemFlag.java
new file mode 100644
index 000000000..fa77de086
--- /dev/null
+++ b/src/main/java/net/minestom/server/item/ItemFlag.java
@@ -0,0 +1,11 @@
+package net.minestom.server.item;
+
+public enum ItemFlag {
+
+    HIDE_ATTRIBUTES,
+    HIDE_DESTROYS,
+    HIDE_ENCHANTS,
+    HIDE_PLACED_ON,
+    HIDE_POTION_EFFECTS,
+    HIDE_UNBREAKABLE
+}
diff --git a/src/main/java/net/minestom/server/item/ItemStack.java b/src/main/java/net/minestom/server/item/ItemStack.java
index f7ac1c19c..511492d5a 100644
--- a/src/main/java/net/minestom/server/item/ItemStack.java
+++ b/src/main/java/net/minestom/server/item/ItemStack.java
@@ -4,10 +4,7 @@ import net.minestom.server.data.Data;
 import net.minestom.server.data.DataContainer;
 import net.minestom.server.item.rule.VanillaStackingRule;
 
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.Map;
+import java.util.*;
 
 public class ItemStack implements DataContainer {
 
@@ -31,7 +28,9 @@ public class ItemStack implements DataContainer {
     private boolean unbreakable;
     private ArrayList<String> lore;
 
-    private Map<Enchantment, Integer> enchantmentMap;
+    private Map<Enchantment, Short> enchantmentMap;
+
+    private int hideFlag;
 
     private StackingRule stackingRule;
     private Data data;
@@ -71,6 +70,7 @@ public class ItemStack implements DataContainer {
                 itemStack.isUnbreakable() == unbreakable &&
                 itemStack.getDamage() == damage &&
                 itemStack.enchantmentMap.equals(enchantmentMap) &&
+                itemStack.hideFlag == hideFlag &&
                 itemStack.getStackingRule() == stackingRule &&
                 itemStack.getData() == data;
     }
@@ -123,11 +123,11 @@ public class ItemStack implements DataContainer {
         return lore != null && !lore.isEmpty();
     }
 
-    public Map<Enchantment, Integer> getEnchantmentMap() {
+    public Map<Enchantment, Short> getEnchantmentMap() {
         return Collections.unmodifiableMap(enchantmentMap);
     }
 
-    public void setEnchantment(Enchantment enchantment, int level) {
+    public void setEnchantment(Enchantment enchantment, short level) {
         if (level < 1) {
             removeEnchantment(enchantment);
             return;
@@ -141,7 +141,40 @@ public class ItemStack implements DataContainer {
     }
 
     public int getEnchantmentLevel(Enchantment enchantment) {
-        return this.enchantmentMap.getOrDefault(enchantment, 0);
+        return this.enchantmentMap.getOrDefault(enchantment, (short) 0);
+    }
+
+    public int getHideFlag() {
+        return hideFlag;
+    }
+
+    public void addItemFlags(ItemFlag... hideFlags) {
+        for (ItemFlag f : hideFlags) {
+            this.hideFlag |= getBitModifier(f);
+        }
+    }
+
+    public void removeItemFlags(ItemFlag... hideFlags) {
+        for (ItemFlag f : hideFlags) {
+            this.hideFlag &= ~getBitModifier(f);
+        }
+    }
+
+    public Set<ItemFlag> getItemFlags() {
+        Set<ItemFlag> currentFlags = EnumSet.noneOf(ItemFlag.class);
+
+        for (ItemFlag f : ItemFlag.values()) {
+            if (hasItemFlag(f)) {
+                currentFlags.add(f);
+            }
+        }
+
+        return currentFlags;
+    }
+
+    public boolean hasItemFlag(ItemFlag flag) {
+        int bitModifier = getBitModifier(flag);
+        return (this.hideFlag & bitModifier) == bitModifier;
     }
 
     public boolean isUnbreakable() {
@@ -202,4 +235,8 @@ public class ItemStack implements DataContainer {
 
         ItemStack.defaultStackingRule = defaultStackingRule;
     }
+
+    private byte getBitModifier(ItemFlag hideFlag) {
+        return (byte) (1 << hideFlag.ordinal());
+    }
 }
diff --git a/src/main/java/net/minestom/server/utils/NbtReaderUtils.java b/src/main/java/net/minestom/server/utils/NbtReaderUtils.java
index ca84e605d..a0beca546 100644
--- a/src/main/java/net/minestom/server/utils/NbtReaderUtils.java
+++ b/src/main/java/net/minestom/server/utils/NbtReaderUtils.java
@@ -71,7 +71,7 @@ public class NbtReaderUtils {
 
                 if (listName.equals("StoredEnchantments")) {
                     reader.readByte(); // Should be a compound (0x0A)
-                    int size = reader.readInteger();
+                    int size = reader.readInteger(); // Enchants count
 
                     for (int ench = 0; ench < size; ench++) {
                         reader.readByte(); // Type id (short)
diff --git a/src/main/java/net/minestom/server/utils/Utils.java b/src/main/java/net/minestom/server/utils/Utils.java
index d45cd4ff2..47f00843f 100644
--- a/src/main/java/net/minestom/server/utils/Utils.java
+++ b/src/main/java/net/minestom/server/utils/Utils.java
@@ -83,7 +83,7 @@ public class Utils {
             packet.writeBoolean(false);
         } else {
             packet.writeBoolean(true);
-            Utils.writeVarInt(packet, itemStack.getMaterialId());
+            packet.writeVarInt(itemStack.getMaterialId());
             packet.writeByte(itemStack.getAmount());
 
             if (!itemStack.hasNbtTag()) {
@@ -101,10 +101,13 @@ public class Utils {
                 packet.writeInt(1);
             }
 
-            // Damage
-            packet.writeByte((byte) 0x02);
-            packet.writeShortSizedString("Damage");
-            packet.writeShort(itemStack.getDamage());
+            // Start damage
+            {
+                packet.writeByte((byte) 0x02);
+                packet.writeShortSizedString("Damage");
+                packet.writeShort(itemStack.getDamage());
+            }
+            // End damage
 
             // Display
             boolean hasDisplayName = itemStack.hasDisplayName();
@@ -137,22 +140,23 @@ public class Utils {
             // End display
 
             // Start enchantment
+            // FIXME: something is broken, enchants are basically ignored...
             {
-                Map<Enchantment, Integer> enchantmentMap = itemStack.getEnchantmentMap();
+                Map<Enchantment, Short> enchantmentMap = itemStack.getEnchantmentMap();
                 if (!enchantmentMap.isEmpty()) {
-                    packet.writeByte((byte) 0x09); // list
+                    packet.writeByte((byte) 0x09); // Type id (list)
                     packet.writeShortSizedString("StoredEnchantments");
 
                     packet.writeByte((byte) 0x0A); // Compound
                     packet.writeInt(enchantmentMap.size()); // Map size
 
-                    for (Map.Entry<Enchantment, Integer> entry : enchantmentMap.entrySet()) {
+                    for (Map.Entry<Enchantment, Short> entry : enchantmentMap.entrySet()) {
                         Enchantment enchantment = entry.getKey();
-                        int level = entry.getValue();
+                        short level = entry.getValue();
 
                         packet.writeByte((byte) 0x02); // Type id (short)
                         packet.writeShortSizedString("lvl");
-                        packet.writeShort((short) level);
+                        packet.writeShort(level);
 
                         packet.writeByte((byte) 0x08); // Type id (string)
                         packet.writeShortSizedString("id");
@@ -166,6 +170,16 @@ public class Utils {
             }
             // End enchantment
 
+            // Start hide flags
+            /*{
+                int hideFlag = itemStack.getHideFlag();
+                if (hideFlag != 0) {
+                    packet.writeByte((byte) 3); // Type id (int)
+                    packet.writeShortSizedString("HideFlags");
+                    packet.writeInt(hideFlag);
+                }
+            }*/
+
             packet.writeByte((byte) 0); // End nbt
         }
     }