Doug Mackro took a perfectly good kayak and broke it into pieces. But he had a way to fit them all back together again. And he patented it. The collapsible kayak, which fits in a 3½-foot backpack, is called Pakayak. He and his business partners are promoting it as “the world’s first nesting kayak,” the six sections slipping snugly inside each other like Russian nesting dolls. Read more…