My wife wonders how large my thermos collection is going to get. A lot larger, I think.

We test each thermos to determine how it performs with leaks, heat retention, ease of use, cleaning, etc.

Here’s the minimum you need

  • Lined ¬†with stainless steel (not glass or plastic)
  • Wide mouth (a narrow mouth helps with heat retention, but makes it harder to remove some foods and to clean)
  • Right size (thermoses are as small as 12 oz. or as big as 64 oz. Get the one that’s the right size for your family or use)
  • Quality name (we suggest using either Thermos brand or Stanley)

Heat Retention Tests

To see how different thermoses hold in heat, we tested them by pouring boiling water into each of them and then testing the water temperature after 1 hour, 12 hours, and 24 hours.

Here are the results:

1 hour 12 hours 24 hours
Thermos Nissan 34 oz. 199 172 149
Thermos Stainless King 40 oz. 198 169 147
Thermos Sportsman 40 oz. 199 167 140
Stanley Classic 32 oz. 194 160 139

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