Tributary HD 9.5 Self Bailing RaftThe Tributary 9. 5 SB whitewater raft offers an exhilarating ride for two, three or four paddlers on all levels of whitewater. It's is the perfect little boat for paddling R2 to R4 or for use as a super sporty mini oar rig. This boat is equipped with one thwart, optimally positioned to properly balance two paddlers, and bow and stern handles for easy transport or portaging. Tributary rafts are constructed using a two layer system; a PVC outer skin and