An endoluminal prosthesis system includes a tubular graft having a pocket on the exterior of the graft. The graft further includes a wire extending within a lumen of the graft, with the wire extending through the passageway and into the pocket. An extension prosthesis can be inserted over the wire and into engagement with the pocket and the passageway, where the extension prosthesis can be sealed with the pocket and the passageway to seal the otherwise unused passageway in the graft.