ShipmentItemCollection::getWeight

public function getWeight() : float
{
	$weight = 0;

	/** @var ShipmentItem $shipmentItem */
	foreach ($this->getShippableItems() as $shipmentItem)
	{
		$basketItem = $shipmentItem->getBasketItem();

		$weight += $basketItem->getWeight() * $shipmentItem->getQuantity();
	}

	return $weight;
}