Change total woocommerce order weight

Question

I need change total weight of order in woocommerce website.

For example: I have a 3 product in a cart: 1 - 30g; 2 - 35; 3 - 35g; total = 30+35+35 = 100g, but I want

Answer 1

It's working at my end. Update total weight to new weight value.

add_action('woocommerce_cart_collaterals', 'myprefix_cart_extra_info');
function myprefix_cart_extra_info() {
    global $woocommerce;
    echo '
';
    echo '
' . __('Total Weight:', 'woocommerce');
    echo ($woocommerce->cart->cart_contents_weight*0.3)+$woocommerce->cart->cart_contents_weight;   
    echo '
';
    echo '
';
}