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|