Print packing slips directly from Squarespace

I use a shipping extension (currently deciding between Shippo and Pirate Ship, formerly used Shipstation). When I'm in the external shipping platform site, I can print labels to my label printer, but want to avoid printing packing slips on 4x6 labels. Unfortunately it doesn't seem possible to print multiple packing slips to page with these shipping platforms - they will only print packing slips along with each label. 
So I'm wondering - is there any integration I can use to print multiple packing slips to a page (on my regular printer) directly from Squarespace? I don't want a full-page invoice with every order - a packing slip without prices would be ideal.