need to haul a boat with you bike, $10 at the hardware store and you are all set

Well assuming of course you have an old kid carrier for the other end, or the wheel kit for your kayak/boat to cart it around.  The author basically has a long PVC pipe arm that you attach one end of the boat to.  Downside…stopping.  I totally see the boat swinging into the rear wheel on this build.

http://www.bikehacks.com/bikehacks/2015/11/kayak-orcanoe-bike-hauling-hack.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+BikeHacks+%28BikeHacks%29