Just installed the storage box and seat support on my V20. It replaces the variable angle system I had on and did not use much. This gives me enough storage for long day rides and results in a back angle of +/- 35 degrees. It is accessed through a side door secured by Velcro strips. It's made of vacuum molded fiberglass and was intended as a prototype for a final carbon version. It works well enough and took long enough to make so there will be no carbon fiber version, and the prototype is the final.