Consignment. The Abaco 13.5 Tandem Sit-On-Top Kayak is designed so that novice and experienced paddlers alike will enjoy recreational paddling in conditions ranging from flat water to flowing rivers to small surf. Why does buying a tandem over a solo make sense for a lot of people? In a word: versatility. There’s not only the social component to paddling together as one, you also benefit from increased speed with double the number of paddlers.