Vintage Desert Water Bag. Canvas bags that were made in the 1950s.

In the olden days, when bikes and cars had hood ornaments, when you drove across the desert in the western United States, you could keep your water cool. 
You would fill this bag with water, soak the outside of the bag and hang it on the front of your car / bike. The evaporation and wind would keep the water cool. 
Very clever idea.