protected function excludeItems( array $propItems )
	{
		$excludes = array( 'package-length', 'package-height', 'package-width', 'package-weight' );

		foreach( $propItems as $key => $propItem )
		{
			if( in_array( $propItem->getType(), $excludes ) ) {
				unset( $propItems[$key] );
			}
		}

		return $propItems;
	}