I have tried Freshbooks. Nice service, but it only does the invoicing part, leaving me to do the packing list + labelling myself. The service I want/should program myself does both automatically.
Maybe I'm not understanding you correctly but Freshbooks has a service that will print out the invoice, pack it, and send a physical envelope to the client on your behalf. You don't need label or pack, they will do this for you for an additional charge.
