Why? I was car camping along the way and it was going to rain. I didn't see any point starting a backpacking trip in the next few days with a soaking wet tent when I happen to have a tarp in trunk that I had forgotten to leave home. Notice my ingenious use of bungee cords. I had no rope or para-cord with me, but I did have an unopened package of bungee cords still in my trunk!