Hi Erwan you need to add this filter to your theme functions.php or if present to the woocommerce.php funnction file
<?php
/**
* Plugin Name: WooCommerce Product Bundles – Variable Container Weight
* Plugin URI: https://woocommerce.com/products/product-bundles/
* Description: Use this snippet to have the weight of bundled products added to the container weight when the Shipped Individually item option is unchecked.
* Version: 1.0
* Author: SomewhereWarm
* Author URI: https://somewherewarm.gr/
* Developer: Manos Psychogyiopoulos
*
* Requires at least: 3.8
* Tested up to: 4.8
*
* Copyright: ? 2017 Manos Psychogyiopoulos ([email protected]).
* License: GNU General Public License v3.0
* License URI: https://www.gnu.org/licenses/gpl-3.0.html
*/
// To use this snippet, download this file into your plugins directory and activate it, or copy the code under this line into the functions.php file of your (child) theme.
add_filter( ‘woocommerce_bundled_item_has_bundled_weight’, ‘wc_pb_bundled_weight’, 10, 4 );
function wc_pb_bundled_weight( $has_bundled_weight, $product, $bundled_item_id, $bundle ) {
return true;
}