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Thermal Food Jars

We tested six thermal food jars to see if any could keep their contents not only palatably hot or cold but also food-safe for several hours.

Published Mar. 1, 2015.

What You Need To Know

Thermal food jars are small, insulated, stainless-steel vessels that promise to keep food hot or cold on the go. We wondered if any could keep their contents not only palatably hot or cold but also food-safe for several hours since the U.S. Department of Agriculture discourages leaving cooked food between 40 and 140 degrees for more than 2 hours. So we filled six models (priced from $19.95 to $41.99) with a variety of prepared foods—200-degree tomato soup, 150-degree macaroni and cheese, and 38-degree tuna salad—and monitored the temperatures of the foods for 4 hours.

Discouragingly, only three vessels held the soup above 140 degrees for the duration of testing, and no jar kept the macaroni and cheese or tuna salad food-safe for even 2 hours, since the windows between their starting and food-safe temperatures were narrower. Some jars also lost points for durability, spilling when we shook them for 30 seconds and denting when we dropped them while they were in a backpack. Odors clung to the model with an internal plastic container.

If hot soup is all you transport, there was one model that will get the job done. It also cleans up in the dishwasher. But don’t expect any model to maintain food-safe temperatures for very long if its contents don’t start out very hot or very cold.

Everything We Tested

Good : 3 stars out of 3.Fair : 2 stars out of 3.Poor : 1 stars out of 3.
*All products reviewed by America’s Test Kitchen are independently chosen, researched, and reviewed by our editors. We buy products for testing at retail locations and do not accept unsolicited samples for testing. We list suggested sources for recommended products as a convenience to our readers but do not endorse specific retailers. When you choose to purchase our editorial recommendations from the links we provide, we may earn an affiliate commission. Prices are subject to change.
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Reviews you can trust

Reviews you can trust

The mission of America’s Test Kitchen Reviews is to find the best equipment and ingredients for the home cook through rigorous, hands-on testing. We stand behind our winners so much that we even put our seal of approval on them.