I would add under shipping some supply chain features.
-Ability to export orders in real-time to a warehouse or your internal fulfillment center
-synchronizing to give your customers tracking information with their order
-plug into multiple warehouse so you can fulfill inventory out of multiple warehouses
Just some thoughts to help with shipping and storage. As your business succeeds order fulfillment will become either a giant hassle or a way for you to distinguish your service to buyers.
Shipwire helps you delight your customers.
Nate