flectra/addons/delivery/views/report_package_barcode.xml

<flectra>
    <template id="report_package_barcode_delivery" inherit_id="stock.report_package_barcode">
        <xpath expr="//div[hasclass('o_packaging_type')]" position="after">
            <div class="row o_package_weight" t-if="o.weight">
                <div class="col-xs-12" style="font-weight:bold;">Weight: <span t-field="o.weight"/></div>
            </div>
            <div class="row o_package_shipping_weight" t-if="o.shipping_weight">
                <div class="col-xs-12" style="font-weight:bold;">Shipping Weight: <span t-field="o.shipping_weight"/></div>
            </div>
        </xpath>
    </template>

    <template id="report_package_barcode_small_delivery" inherit_id="stock.report_package_barcode_small">
        <xpath expr="//div[hasclass('o_packaging_type')]" position="after">
            <div class="row o_package_weight" t-if="o.weight">
                <div class="col-xs-12" style="font-size:24px; font-weight:bold;">Weight: <span t-field="o.weight"/></div>
            </div>
            <div class="row o_package_shipping_weight" t-if="o.shipping_weight">
                <div class="col-xs-12" style="font-size:24px; font-weight:bold;">Shipping Weight: <span t-field="o.shipping_weight"/></div>
            </div>
        </xpath>
    </template>
</flectra>