Has your order volume grown beyond homegrown shipping and order fulfillment to the point of needing to use a 3rd party warehouse?
If you the freedom to use shippers that aren't natively supported by SHopify, try our CSV to FTP a simple app that allows you to bulk load all your orders to any pick, pack and shipper who supports FTP file transfers (which is pretty much all of them :)
https://apps.shopify.com/csv-to-ftp