Why does amazon still use freight companies like USPS and FedEX? At this point, I feel like amazon should open up physical locations where people can pick up/drop off packages (this includes returns). Perhaps even maintain inventory and have a showroom for people who want to walk in and purchase something.
The return flow varies. Amazon knows what type of package your item(s) were sent it. If it didn't come in a box, you'll be forced to buy one at USPS. If you are lucky enough to have Kohls as a dropoff option, then this isn't an issue. I'm not sure what determines USPS or Kohls as the return location when you print the waybill.