Here is a nice clean vintage flax water bag that was made to carry water and keep water cool in hot desert conditions. The idea that works is that air from wind movement blows against the flax material that naturally breath in such a way that it is a water cooler of sorts.
It was manufactured by The Pueblo Tent & Awning Co. Pueblo, Colorado.
It looks like it's never been used, black stain on the back. See pictures for condition.
It is 11" x 15 1/2"