diff --git a/src/Model/PacketAttributes.php b/src/Model/PacketAttributes.php
index a9d2c48..8ace643 100644
--- a/src/Model/PacketAttributes.php
+++ b/src/Model/PacketAttributes.php
@@ -52,6 +52,8 @@ final class PacketAttributes implements IModel
 
     private ?string $customerBarcode;
 
+    private ?Size $size;
+
 
     public function __construct(
         string $number,
@@ -75,7 +77,8 @@ public function __construct(
         ?string $carrierPickupPoint = null,
         ?string $carrierService = null,
         ?DispatchOrder $dispatchOrder = null,
-        ?string $customerBarcode = null
+        ?string $customerBarcode = null,
+        ?Size $size = null
     ) {
         $this->setNumber($number);
         $this->setName($name);
@@ -99,6 +102,7 @@ public function __construct(
         $this->setCarrierService($carrierService);
         $this->setDispatchOrder($dispatchOrder);
         $this->setCustomerBarcode($customerBarcode);
+        $this->setSize($size);
     }
 
 
@@ -372,6 +376,16 @@ public function setCustomerBarcode(?string $customerBarcode): void
         $this->customerBarcode = $customerBarcode;
     }
 
+    public function getSize() : ?Size
+    {
+        return $this->size;
+    }
+
+    public function setSize(?Size $size) : void
+    {
+        $this->size = $size;
+    }
+
 
     /**
      * @return mixed[]
diff --git a/src/Model/Size.php b/src/Model/Size.php
new file mode 100644
index 0000000..c1ebe88
--- /dev/null
+++ b/src/Model/Size.php
@@ -0,0 +1,61 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Salamek\Zasilkovna\Model;
+
+final class Size implements IModel
+{
+    private int $length;
+    private int $width;
+    private int $height;
+
+    public function __construct(
+        int $length,
+        int $width,
+        int $height
+    ) {
+        $this->setLength($length);
+        $this->setWidth($width);
+        $this->setHeight($height);
+    }
+
+    public function getLength() : int
+    {
+        return $this->length;
+    }
+
+    public function setLength(int $length) : void
+    {
+        $this->length = $length;
+    }
+
+    public function getWidth() : int
+    {
+        return $this->width;
+    }
+
+    public function setWidth(int $width) : void
+    {
+        $this->width = $width;
+    }
+
+    public function getHeight() : int
+    {
+        return $this->height;
+    }
+
+    public function setHeight(int $height) : void
+    {
+        $this->height = $height;
+    }
+
+
+    /**
+     * @return mixed[]
+     */
+    public function toArray(): array
+    {
+        return get_object_vars($this);
+    }
+}