These fares don't offer a checked baggage allowance, the fares are non-refundable and Basic Economy passengers board last. (travelingformiles.com)
In addition, some airlines offer premium economy passengers such amenities as priority boarding, an increased luggage allowance, and upgraded seats, meals, and drinks. (frequentbusinesstraveler.com)
And finally, these changes may actually be good for economy passengers. (uponarriving.com)