Travel just became a bit more complicated on Lufthansa. As a Lufthansa FF I get these advance notices. As of Oct 1, for internal flights on Lufthansa, there is now three levels to economy tickets - Light, Classic, and Flex. Light is carry-on only with optional fees for luggage, seat reservation, etc. Classic is one checked bag up to 23kg, and Flex is what flex sounds like. For greater detail see -- https://www.lufthansa.com/xx/en/European-fares-Economy-Class?WT.mc_id=email_lhcom_US_en_232015073022
These fare levels do not apply to international flights or connecting flights associated with an international flight. Drifting towards a la carte pricing.