That is a tour pack or "Trunk" on a full on FLHTCU Geezer Glide Bagger. Top Box comments are not applicable to such. Gold Wings are also exempt as are Kawasaki Voyagers and Yamaha Ventures. All these bikes were designed around the Trunk and the Queens Throne and as such just do not look right without them. Translation: Rolling Barcoloungers need not apply. edit: p.s. I can't believe you have not changed out those hideous hinges yet.