diff --git a/CHANGELOG.md b/CHANGELOG.md
index 458bea0..9113c47 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## 0.5.0 - 2026-05-05
+- Single-shipment-per-order now uses merchant default parcel size from settings instead of summing item dimensions
+- Added `getDefaultParcelWidth/Height/Length/Weight` to `PayseraDeliverySettingsInterface`
+- `ShipmentsAdapter::convert()` signature changed: now accepts `PayseraDeliverySettingsInterface` instead of a bool flag
+
 ## 0.4.0 - 2026-02-18
 - Add credentials validation feature
 
diff --git a/composer.lock b/composer.lock
index d363673..822c6b6 100644
--- a/composer.lock
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         "php": ">=7.4"
     },
-    "platform-dev": {},
+    "platform-dev": [],
     "plugin-api-version": "2.6.0"
 }
diff --git a/src/Adapter/OrderCreateRequestAdapter.php b/src/Adapter/OrderCreateRequestAdapter.php
index 9581584..5e4f158 100644
--- a/src/Adapter/OrderCreateRequestAdapter.php
+++ b/src/Adapter/OrderCreateRequestAdapter.php
@@ -45,7 +45,7 @@ public function convert(PayseraDeliveryOrderRequest $request): OrderCreate
             ->setShipmentMethodCode(
                 $this->gatewayUtils->getShipmentMethodCode($deliveryGateway->getSettings())
             )
-            ->setShipments([...$this->shipmentsAdapter->convert($orderDto->getItems(), $request->getDeliverySettings()->isSinglePerOrderShipmentEnabled())])
+            ->setShipments([...$this->shipmentsAdapter->convert($orderDto->getItems(), $request->getDeliverySettings())])
             ->setReceiver(
                 $this->shipmentPointAdapter->convert(
                     $orderDto->getShipping(),
diff --git a/src/Adapter/OrderUpdateRequestAdapter.php b/src/Adapter/OrderUpdateRequestAdapter.php
index be0594d..d56855e 100644
--- a/src/Adapter/OrderUpdateRequestAdapter.php
+++ b/src/Adapter/OrderUpdateRequestAdapter.php
@@ -45,7 +45,7 @@ public function convert(PayseraDeliveryOrderRequest $request): OrderUpdate
             ->setShipmentMethodCode(
                 $this->gatewayUtils->getShipmentMethodCode($deliveryGateway->getSettings())
             )
-            ->setShipments([...$this->shipmentsAdapter->convert($orderDto->getItems(), $request->getDeliverySettings()->isSinglePerOrderShipmentEnabled())])
+            ->setShipments([...$this->shipmentsAdapter->convert($orderDto->getItems(), $request->getDeliverySettings())])
             ->setReceiver(
                 $this->shipmentPointAdapter->convert(
                     $orderDto->getShipping(),
diff --git a/src/Adapter/ShipmentsAdapter.php b/src/Adapter/ShipmentsAdapter.php
index 4c7b6e8..713b67d 100644
--- a/src/Adapter/ShipmentsAdapter.php
+++ b/src/Adapter/ShipmentsAdapter.php
@@ -7,6 +7,7 @@
 use Paysera\DeliveryApi\MerchantClient\Entity\ShipmentCreate;
 use Paysera\DeliverySdk\Collection\OrderItemsCollection;
 use Paysera\DeliverySdk\Entity\MerchantOrderItemInterface;
+use Paysera\DeliverySdk\Entity\PayseraDeliverySettingsInterface;
 
 class ShipmentsAdapter
 {
@@ -16,38 +17,29 @@ class ShipmentsAdapter
      */
     public function convert(
         OrderItemsCollection $items,
-        bool $isSinglePerOrderShipmentEnabled = false
+        PayseraDeliverySettingsInterface $deliverySettings
     ): iterable {
-        if ($isSinglePerOrderShipmentEnabled) {
-            return $this->createSingleShipment($items);
+        if ($deliverySettings->isSinglePerOrderShipmentEnabled()) {
+            if (count($items) === 0) {
+                return [];
+            }
+            return $this->createSingleShipment($deliverySettings);
         }
         return $this->createMultipleShipments($items);
     }
 
     /**
-     * @param OrderItemsCollection<MerchantOrderItemInterface> $items
+     * @param PayseraDeliverySettingsInterface $deliverySettings
      * @return iterable<ShipmentCreate>
      */
-    private function createSingleShipment(OrderItemsCollection $items): iterable
+    private function createSingleShipment(PayseraDeliverySettingsInterface $deliverySettings): iterable
     {
-        $width = 0;
-        $height = 0;
-        $length = 0;
-        $weight = 0;
-
-        foreach ($items as $item) {
-            $width += $item->getWidth();
-            $height += $item->getHeight();
-            $length += $item->getLength();
-            $weight += $item->getWeight();
-        }
-
         return [
             (new ShipmentCreate())
-                ->setLength((int) ceil($length))
-                ->setWidth((int) ceil($width))
-                ->setHeight((int) ceil($height))
-                ->setWeight((int) ceil($weight)),
+                ->setLength($deliverySettings->getDefaultParcelLength())
+                ->setWidth($deliverySettings->getDefaultParcelWidth())
+                ->setHeight($deliverySettings->getDefaultParcelHeight())
+                ->setWeight($deliverySettings->getDefaultParcelWeight()),
         ];
     }
 
diff --git a/src/Entity/PayseraDeliverySettingsInterface.php b/src/Entity/PayseraDeliverySettingsInterface.php
index d84dae3..f764fc5 100644
--- a/src/Entity/PayseraDeliverySettingsInterface.php
+++ b/src/Entity/PayseraDeliverySettingsInterface.php
@@ -24,4 +24,12 @@ public function isHouseNumberFieldEnabled(): ?bool;
     public function getUserAgent(): string;
 
     public function isSinglePerOrderShipmentEnabled(): bool;
+
+    public function getDefaultParcelWidth(): int;
+
+    public function getDefaultParcelHeight(): int;
+
+    public function getDefaultParcelLength(): int;
+
+    public function getDefaultParcelWeight(): int;
 }
diff --git a/tests/Adapter/ShipmentsAdapterTest.php b/tests/Adapter/ShipmentsAdapterTest.php
index e27906a..ba85c8a 100644
--- a/tests/Adapter/ShipmentsAdapterTest.php
+++ b/tests/Adapter/ShipmentsAdapterTest.php
@@ -33,7 +33,7 @@ public function testConvertWithMultipleShipments(): void
             ->method('isSinglePerOrderShipmentEnabled')
             ->willReturn(false);
 
-        $shipments = [...$this->shipmentsAdapter->convert($this->itemsCollection)];
+        $shipments = [...$this->shipmentsAdapter->convert($this->itemsCollection, $this->settingsMock)];
 
         $this->assertCount(2, $shipments);
 
@@ -56,8 +56,12 @@ public function testConvertWithSingleShipment(): void
         $this->settingsMock
             ->method('isSinglePerOrderShipmentEnabled')
             ->willReturn(true);
+        $this->settingsMock->method('getDefaultParcelLength')->willReturn(100);
+        $this->settingsMock->method('getDefaultParcelWidth')->willReturn(80);
+        $this->settingsMock->method('getDefaultParcelHeight')->willReturn(60);
+        $this->settingsMock->method('getDefaultParcelWeight')->willReturn(120);
 
-        $shipments = [...$this->shipmentsAdapter->convert($this->itemsCollection, true)];
+        $shipments = [...$this->shipmentsAdapter->convert($this->itemsCollection, $this->settingsMock)];
 
         $this->assertCount(1, $shipments);
         $shipment = $shipments[0];
@@ -68,6 +72,17 @@ public function testConvertWithSingleShipment(): void
         $this->assertEquals(120, $shipment->getWeight());
     }
 
+    public function testConvertWithSingleShipmentReturnsNothingWhenItemsAreEmpty(): void
+    {
+        $this->settingsMock
+            ->method('isSinglePerOrderShipmentEnabled')
+            ->willReturn(true);
+
+        $shipments = [...$this->shipmentsAdapter->convert(new OrderItemsCollection([]), $this->settingsMock)];
+
+        $this->assertCount(0, $shipments);
+    }
+
     private function createItemMock(int $height, int $width, int $length, int $weight): MerchantOrderItemInterface
     {
         $mock = $this->createMock(MerchantOrderItemInterface::class);