The Pannier Adapter helps your Cargo Hold 37 and Cargo Hold 52 Panniers play nicely with a child seat in the rear position on the GSD. When using a Cargo Hold 37 or Cargo Hold 52 Pannier in bucket mode, attach the Pannier Adapter to the GSD frame and secure the Fidlock® magnetic buckle across the top. The child seat's legs go inside the open panniers and the straps are prevented from dangling around while you ride. Tidy!