HI Pal, Per the eBay Help page:
Reprinting a label
You can reprint a label by going to the Sold section of My eBay and clicking View order details next to the item. On the Order Details page, click the Reprint link in the shipping information next to the item. You can reprint a label up to 10 times.
http://pages.ebay.ca/help/pay/printing-labels.html#create
It doesn't specify if that's the correct procedure for handling two packages at once. You can give it a try and see what happens, or click around the Help section and see if you can find a more definitive answer, or check back to see if someone else posts a more conclusive response. Good luck!