To take a knitting or crochet project on the road, wash out a domed-lid plastic cup and stick your yarn in it. Needles/hook can slip in through the hole. This would be PERFECT for taking a project in the car because you can put it in a cup holder!
I've seen versions of these now a few times and I really do love the look, and though this particular scarf doesn't come with a pattern, they seem pretty basic to figure out. Hmm, I can think of a few people that would like one for Christmas :)