we are into eCommerce business and doing retail export
following option will be very helpful
1.single package for multiple sale order
or
2.package based on invoices...After converting multiple saleorder into single invoice there should be a option to create package from invoice ..as it is not possible to split invoices for multiple shipments. we will not able to attached single invoice(attaching invoice along shipments is mandatory as per gov rules) along all multiple shipments