Hi Luke,

Thanks for reaching out with this feature request. This is definitely a great idea and one that I hope we one day will have, too! We are currently provided label PDFs by our carriers (including UPS, FedEx, and USPS). There is a lengthy approval process to make any changes, even minor ones, to their label formats. This year we were approved for USPS so I can imagine the process would be similar if we requested this from our other carriers. That said, I will forward your feedback to our Product Team so that they are aware in your interest in seeing SKUs on UPS labels. Please keep an eye on this thread for possible future updates. Thanks again!

After digging into this further, I have found some good information regarding why we have not added this for UPS:

We actually did look into adding doc tabs to UPS labels, however this feature was not supported/available via UPS' API. We had looked into adding UPS doc tabs with the intention of adding additional information to the shipping labels, such as SKU, etc. However, we ran into a hitch as the doc tabs are only available via the UPS WorldShip program. As such, we are not going to be able to come up with the same custom label templates that we did for USPS labels. I apologize for that. Hopefully one day soon UPS will allow us to support this.