You can use zip ties but they are expensive and not easily reusable or try these http://www.homedepot.com/p/Sigman-6-in-Tarp-Ball-Bungee-25-Pack-BB06B/203217327 6" Ball type bungee cords. Also I think uline is cheaper for the poly tubing http://www.uline.com/Product/Detail/S-2941/Poly-Tubing/6-Mil-Heavy-Duty-Poly-Tubing-Roll-5-x-1000