product_packaging.xml

<?xml version="1.0" encoding="utf-8" ?>
<!-- Copyright 2021 ACSONE SA/NV
     License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl). -->
<odoo noupdate="1">
  <record id="product_packaging_gls_parcel" model="product.packaging">
    <field name="name">GLS: Parcel</field>
    <field name="package_carrier_type">gls</field>
    <field name="shipper_package_code">PARCEL</field>
    <field name="max_weight">40</field>
  </record>
  <record id="product_packaging_gls_express" model="product.packaging">
    <field name="name">GLS: Express</field>
    <field name="package_carrier_type">gls</field>
    <field name="shipper_package_code">EXPRESS</field>
    <field name="max_weight">40</field>
  </record>
  <record id="product_packaging_gls_freight" model="product.packaging">
    <field name="name">GLS: Freight</field>
    <field name="package_carrier_type">gls</field>
    <field name="shipper_package_code">FREIGHT</field>
    <field name="max_weight">40</field>
  </record>
</odoo>