Yes, the round-trip ticket is available for the hikes that cross the Belalp-Riederalp suspension bridge. This is valid for travel on the PostBus from Brig to Blatten bei Naters, the cable car from Blatten to Belalp, the downhill ride Riederalp – Mörel, Bettmeralp – Betten valley station or Fiescheralp – Fiesch in the Aletsch Arena, as well as the train between Fiesch and Brig or vice versa.