<block type="sales/order_email_shipment_items" name="items" template="email/order/shipment/items.phtml">
   <action method="addItemRender">
      <type>default</type>
      <block>sales/order_email_items_default</block>
      <template>email/order/items/shipment/default.phtml</template>
   </action>
</block>
<block type="core/text_list" name="additional.product.info"/>
<reference name="items">
   <action method="addItemRender">
      <type>bundle</type>
      <block>bundle/sales_order_items_renderer</block>
      <template>bundle/email/order/items/shipment/default.phtml</template>
   </action>
</reference>
