Filter WooCommerce Cart Contents Weight

wc-filter-cart-contents-weight

add_filter( 'woocommerce_cart_contents_weight', 'prefix_filter_cart_contents_weight' );
function prefix_filter_cart_contents_weight( $weight ) {
	/**
	 * Adding 170 units to the total cart weight.
	 */
	return $weight + 170;
}