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This goal of this experiment is to identify:
Links to Containers:
Genuine Joe: http://amzn.to/2zgDiuJ
Stanley Classic: http://amzn.to/2ziOhUE
Ozark Trail: http://amzn.to/2zmMxf5
These containers are large enough to store at least 8 cups of coffee. We have two:
These containers vary in size, but all are designed to allow one to use as portable cups from which to drink hot or cold liquids. There are four in this test:
These containers serve as controls in the experiment. We have two controls:
Initial Heat Loss
Since all containers started at room temperature and the water started at boiling, the water will immediately transfer some heat to the vessel as soon as the water comes into contact with the surface. The first data point in the chart, measured at 2:20 PM, reflects this initial heat loss. It does include a very small time lapse – just enough necessary to get all the containers topped off with boiling water and temperatures measured.
Gradual Heat Loss
I measured the temperature of the water every half hour for three and a half hours. During this time, a clear pattern emerged. The large containers (Genuine Joe and Stanley Classic), which have the best storage volume to non-insulated surface area ratio, did the best.
The second group was the vacuum insulated cup group (Yeti, Ozark Trail, Starbucks). This group of containers all did quite well, and roughly equal to each other.
The third group consist of just the Tervis. It is insulted, but not as well as the vaccum insulated models. The graph reflects this.
The control groups cooled the quickest, with the Hardee’s cup maintaining slightly higher temperatures throughout the test. This is expected since it is sort of insulated.
Final Heat Loss
After 3.5 hours, I only took two more readings. The first of these was at 7:50 PM, and the final was the next morning at 6:40 AM. While the test was not surprising in any way, the final reading at 6:40 AM made it abundantly clear which container is the best.
The device that kept the water hottest for the longest period of time was the Stanley Classic Vacuum Bottle. I have had this thermos for over twenty years, and I know it will last and can handle some abuse.
The best container for drinking directly out of is the Ozark Trail. It performed about the same as the Yeti and the Starbucks, but cost about a third of the other two.
I’d also like to give an honorable mention to the Tervis. It did not perform as well as the vacuum insulated models in this test, but in my experience, it works well. Plus, it is the only drinking container that is made in the USA.