The neck's important too

Another spot to keep ice applied during the heat of the day at Badwater, is the back of your neck.
Several commercial scarves with those magic crystals inside that swell after being soaked in water. They are supposed to keep your neck cool. I found they did not work.
I created the top scarf with a hidden pocket lined with an artificial chamois from a cheap handkerchief.
I placed a handkerchief over the chamois on a flat surface. I then located a zipper on one half (based on a line run from one corner diagonally to the opposite corner) and sewed the zipper in place. I then opened the zipper and cut through the scarf and chamoise to create an opening.
I then folded the scarf in half along the diagonal points, forming a triangle, sewed around the edges and then to form a pocket in the triangle that the scarf was now formed into.
The bottom scarf in the two scarf picture is a commercially available from Zombie Runner here.
I have stuck a water bottle in the side opening where the ice is loaded. The scarf is also lined with a chamois.