Package products include "files" from other products, so there is no concept of packaging tangible items. If you create the package product and enable shipping for it, you will get buyer address and you can also include digital files in this product from your other products using the package feature.
You can calculate shipping if the shipping checkbox is checked. However, our shipping calculation work with E-junkie cart only which only supports PayPal Standard, PayPal Pro, Google Checkout and Authorize.Net.