The 6 Best Hot Food Thermoses in 2021

Feel confident your food will stay warm for hours

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Hot Food Thermoses

The Spruce Eats / Chloe Jeong

Our Top Picks
This Thermos can keep liquids hot for nine hours and cold for up to 14 hours.
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A favorite with parents, this 10-ounce Thermos fits perfectly into most lunch boxes.
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A wide brim makes eating less challenging for little ones.
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Not only is it affordable, but it's also leak- and sweat-proof.
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The durable exterior was crafted with outdoor adventures in mind.
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This canister is Climate Neutral Certified and a portion of each sale is donated to the nonprofit 1% for the Planet.
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Eating on the go is one activity almost everyone can relate to. The pace of contemporary life necessitates longer daily travel time for people of all ages. A study released by the U.S. Census Bureau in late 2019 revealed that the average American commute grew to just over 27 minutes one way—a record high.

It certainly is easy to stop for a quick-service meal along your route, but relying on fast food for daily sustenance can take a toll on one’s finances and health. With the right storage containers, taking wholesome food along to the office, school, or on a road trip is a cinch. To help find one that suits your needs, we researched top products suitable for all the great to-go meals you've been planning to whip up at home.

Here are the best hot food thermoses.

Best Overall: Thermos Stainless King Food Jar

What We Like
  • Retains heat well

  • Firm seal prevents leaks

What We Don't Like
  • Outside plastic laminate gradually peels off

Thanks to an uber-tight seal, the forerunner of this list is touted as having maximum temperature retention for hot and cold food. The Thermos King can keep liquids hot for nine hours and cold for up to 14 hours. Another major benefit is that the lid is designed to be used as a bowl in tandem with the included standard-sized stainless steel folding spoon. Each component of this model can safely be washed in the top rack of your dishwasher, allowing easy upkeep for busy professionals on the go.

Capacity: 16 ounces | Heat Retention: Up to nine hours | Cold Retention: Up to 14 hours

Best for Kids: Thermos Foogo Vacuum Insulated Stainless Steel Food Jar

What We Like
  • Dishwasher safe

  • BPA-free

What We Don't Like
  • Lid seal needs occasional deep cleaning

Ergonomically designed with kids in mind, the Foogo is a favorite with parents, as its cool-to-the-touch 10-ounce body fits perfectly into most lunchboxes. The base and lid are made of rubber to make the jar easier to grip for smaller hands, too. Other perks include cost efficiency, a tough body resistant to scratches, and the ability to keep food warm for about six hours or cold for up to 10 hours.

Capacity: 10 ounces | Heat Retention: Up to six hours | Cold Retention: Up to 10 hours

Runner-Up, Best for Kids: Thermos 10-Ounce Funtainer Food Jar

What We Like
  • Low price

  • Available in a variety of colors

What We Don't Like
  • Hand wash only

Kids will adore the array of colors and character themes the Funtainer comes in. More importantly, a wide brim makes eating less challenging for little ones getting the hang of using serving utensils and the stay-cool exterior won't harm their hands. However, it's imperative to strictly adhere to the instructions for use, such as warming the interior with hot water 20 minutes before adding any food that will be eaten two to five hours later. This model should keep food warm for up to five hours or cold for up to seven hours.

Capacity: 10 ounces | Heat Retention: Up to five hours | Cold Retention: Up to seven hours

Best Budget: Mira Vacuum Insulated Stainless Steel Lunch Thermos

What We Like
  • Very affordable

  • Comes with travel spoons

What We Don't Like
  • May rust after frequent use

Looking for a leak- and sweat-proof vessel on the cheap? MIRA’s Stainless Steel Lunch Thermos delivers that and more. It’s easy to clean by hand due to the larger opening at the top, and the rubber ring inside of the lid can be removed for more adequate scrubbing to prevent mold accumulation. The exterior color selection contains muted hues, such as pearl blue, Hawaiian blue, and light pink, which gives this product line a similar aesthetic to more expensive brands currently on the market. It has an average heat retention of approximately five hours and a cold retention of up to 10 hours.

Capacity: 17 ounces | Heat Retention: Up to five hours | Cold Retention: Up to 10 hours

Best for Travel: Hydroflask 12-Ounce Thermos Food Jar

What We Like
  • Lifetime warranty

  • Compact size

What We Don't Like
  • Limited color selection

Made from non-toxic materials, the leak-proof Hydroflask Food Flask Thermos Jar is just as sleek as the company’s beverage-only models. The durable exterior was crafted with outdoor adventures in mind, so it's quite popular with nature and camping enthusiasts, and the 18/8 stainless steel interior ensures no flavor transfer or lingering odors. Available in multiple sizes, start small with the 10- or 12-ounce container, and then upgrade in size over time if an expanded collection for a family is needed. Just keep in mind that the 20- and 28-ounce versions have higher price points. That said, this should keep your food warm for at least four hours. Some reviewers have even reported excellent heat retention up to 12 hours.

Capacity: 12 ounces | Heat Retention: More than four hours | Cold Retention: N/A

Best Eco-Friendly: Klean Kanteen 8-Ounce Food Canister

What We Like
  • Eco-friendly

  • Stylish

What We Don't Like
  • Pricey

If shopping sustainable is a non-negotiable value, this food canister by Klean Kanteen is an ethical consumer’s best buy. As a certified B Corp, this business has been vetted for meeting the “highest standards of verified social and environmental performance, transparency, and accountability” within the industry, partially thanks to all of its products being Climate Neutral Certified. It has the capacity to keep both hot and cold eats, like ice cream, at a consistent temperature for up to five hours, and the interior is incredibly easy to clean. Better yet, a portion of each sale is donated to the nonprofit 1% for the Planet.

Capacity: 8 ounces | Heat Retention: Up to five hours | Cold Retention: Up to five hours

Final Verdict

For a decently sized thermos that will keep foods, like soup, stew, and more, warm for up to an impressive nine hours, look no further than the Thermos Stainless Steel King Food Jar (view at Amazon). Kids, on the other hand, will love the fun colors and cool touch of the wide-mouthed Thermos Foogo Vacuum Insulated Stainless Steel Food Jar (view at Amazon).

What to Look for When Buying a Hot Food Thermos

By Marshall Bright


Food thermoses tend to be shorter and wider than drink thermoses. This is so you're able to pour contents, such as soup, into the flask—and eat out of it as well. Most have a twist-on lid, which helps prevent spills. Some thermoses will have additional seals or interior lids to keep food safe for further spill protection. 

Thermos Stainless King Food Jar
The Spruce Eats / Suzie Dundas


Stainless steel is the preferred material for thermoses. It won’t absorb color or scent from hot food that is stored in it for a long time and cleans easily. An inner flask keeps contents warm surrounded by a partial vacuum that can’t conduct heat away from the flask. An outer case, usually also steel, allows you to hold the container without condensation or burning your hand. The outer case may also be treated with a coating or surrounded by plastic. 

Even inexpensive models tend to be vacuum-seal stainless steel. However, the vacuum-seal method can be used with other materials like glass and plastic. Because they are not as durable as stainless steel, they are not recommended. 

Thermos Foogo Stainless Steel Food Jar
The Spruce Eats / Suzie Dundas


The size of a thermos largely depends on what you want to use it for. Most thermoses for adults tend to be around 16 ounces, and ones for children are a little smaller. Smaller amounts of food will cool down faster, but if there is excess air in the thermos, the contents will also cool faster. If you want your food to stay hot for several hours, you'll want to use the best size thermos for the amount of food you're putting in it. If you just want the option for a small soup bowl at lunch, you can go with 10 ounces or smaller. If you want to carry a hearty meal in your flask, 16 ounces is likely the better fit. 

Thermos FUNtainer Stainless Steel Food Jar
The Spruce Eats / Suzie Dundas


Thermoses tend to be fairly affordable, and you can typically expect to get a long-lasting one for somewhere between $15 and $30. The more expensive models may boast more fun colors, a tiger seal for the lid, or other accessories, but they all will use the same stainless steel vacuum-sealed design. 

Thermos FUNtainer Stainless Steel Food Jar
The Spruce Eats / Suzie Dundas 

Food Safety

Aside from skipping the microwave, there’s an important reason to keep your food insulated: Food safety. Bacteria can grow in the “danger zone” between 40 and 140 degrees. The USDA generally recommends keeping hot food hot and cold food cold if it needs to be left out for more than two hours. When looking at thermoses, consider how long you will want it to stay hot—many will keep food hot for up to seven hours. That also means it’s actually better to put foods like soups into a thermos when it’s a little too hot to eat. You can always let it cool with the lid off to get it to a pleasant temperature. Better that than a lukewarm (and potentially dangerous) soup at lunchtime. 



Thermos is synonymous with the product it produces—thermoses. But unlike Kleenex and Tupperware, Thermos has not been able to maintain the trademark on the term "thermos." The Thermos company, first started in Germany, was the first to figure out how to take industrial vacuum-sealing techniques and apply them for home use. Today, Thermos makes a wide range of insulated containers, from flasks and mugs to coolers and lunch boxes

Hydro Flask 

Designed for the outdoors, Hydro Flask’s powder-coated flasks and containers are designed to stand up to heavy wear and tear. Available in a wide array of colors, they also come with a lifetime warranty. 

Thermos Foogo Stainless Steel Food Jar
The Spruce Eats / Suzie Dundas


A stainless steel thermos is relatively easy to clean up. Because it won’t absorb scent or color from your food, you can treat it like you would any other dirty dish and wash it with soap and water. Many thermoses are dishwasher safe but not all. This isn’t because of the material but the construction: Dishwashers may mess up the vacuum seal. Interior lids and other accessories, like collapsible forks, may also require additional hand-washing to get rid of built-up grime. 

Thermos Stainless King Food Jar
The Spruce Eats / Suzie Dundas


How do I choose what type of thermos to get?

Before purchasing a thermos, narrow down a preferred size and what it will most frequently be used for. This could range from beverages, like coffee and tea, to meals that need to survive a long day and transport to after-school clubs and sports practices. Perhaps durability is the top concern for long outdoors treks. Check customer reviews to read common raves and complaints about each manufacturer’s products.

How often do I need to clean a thermos?

Ideally, a thermos should be cleaned and fully dried after each use. Bacteria can be transferred between meals if the jar and lid are not sanitized in a dishwasher or hand washed in hot, soapy water prior to being refilled.

How does a thermos work?

Using a stainless steel vacuum-sealed design, an inner flask maintains contents at a consistent temperature, since warm or cold air cannot easily penetrate or escape from the flask. The outer material, usually made of hard plastic or steel, allows the thermos to be comfortably held and transported without liquid leaking out.

How long do thermoses keep contents hot or cold?

High-quality thermal flasks can keep food and beverages warm for as long as a full 24 hours. More economical brands will typically retain the original temperature of contents for four to six hours.

Why Trust The Spruce Eats?

Rachel Werner teaches culinary writing through Hugo House and has been selecting food-based businesses for editorial coverage for over six years. Her product and restaurant reviews, food styling, and photography have appeared in a variety of regional and national publications including Fabulous Wisconsin, BRAVA, and Hobby Farms Magazine.

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