Hello All,
Feature request.
I am looking to see if a feature can be added to automatically add the SKU and order # to Shopify shipping tagline. Packaging slips are old school and a waste of product! Save time and money! 
Hello there @HennyLoc,
This is possible to add the SKU automatically order to # Shopify Shipping tagline. But it’s totally depends on which shipping solution you are using. Whether it’s shopify native one or you are using any third party shipping provider?
If we are using Shopify Shipping as a built-in feature, then you cannot do this customization, as it is not supported by Shopify.
Shopify does not allow modifying the shipping label tagline or injecting dynamic fields like SKU.
If we are using a third-party shipping solution such as ShipStation, Shippo, or Easyship, then this is achievable. In that case, we can pass SKU and order number via tags or metafields (using the Shopify Flow app, which is developed by Shopify) and map them to a label reference field for printing.