We've added an option to our PDF bulk export feature to join each document type into a single file. This should come in handy if you want to print all of your invoices or ever packing list at once. The zip file exported will contain a single PDF for each document type (order confirmation, invoice, credit note etc).If you haven't tried the bulk PDF export feature, you can find it via the Sales Orders page by clicking the "PDFs" drop-down menu: