I had one of these and use to carry it in my truck all of the time. I just glued a small plastic wall hanger on it and tied a piece of pull string or thin nylon rope to it, and I just saved my self 3 to 4 hours of running string everywhere! I used to run data and phone cables not just cctv...
http://www.hobbytron.com/XUFO.html
For small runs, I would just tie the pull string to a full roll of electrical tape and just throw...