These bags (1900-1960s) were used on road trips especially in the desert. The bag was soaked first, then filled and hung on the car’s hood ornament or from the bumper. As water seeped slowly to the surface, it evaporated and cooled keeping the water about 12 degrees cooler than the air. As both air conditioning and coolers for cold drinks were both unavailable to drivers, these offered a somewhat refreshing drink on a long drive.
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