In the 50s and 60s, one of my summer chores was to take cold water to my father and brother as they worked in the fields, cultivating corn/beans or putting up hay. Thermos water coolers were not that common in those days, so I would fill a quart Mason jar with ice cubes and water, place it in an empty 5 lb. sugar sack and walk through the pasture or ride my bike to the field. The sack's multiple layers help to insulate the jar.
Sometimes, I would add a slice of banana bread or a handful of cookies to the bag. When I reached the top of the field, I would wait until the tractor was turned around and stopped before I handed the sack to my father or brother. I remember how they enjoyed the cold drink and snack after working in the blazing afternoon sun in a tractor without a cab for shade. With their thirst quenched, they handed me a tattered sack and and empty Mason jar they had taken with them in the morning, and I left the new one at the top of the field for them to enjoy later. Pictured above is my father on the John Deere tractor (I think it was a "B") that he and my brother used for years. If I remember correctly, the cultivator was attached to the sides of the tractor. I remember riding on the bar behind the driver's seat and hanging on for dear life.
Several years later I worked in the same fields, cultivating or baling. I had the luxury of a tractor cab to keep the sun off of my head. I took an insulated cooler to the field with me, but I looked forward to the afternoons when my mom drove the pickup into the field and handed me a sugar sack that contained a Mason jar filled with cold water.