Thermos Flask Review

Thermos Flask King Beverage Bottle

Manufacturer Thermos
ModelStainless King
Food Jar
Vacuum Insulated
Hydration Bottle
Stainless King
Beverage Bottle
Retail ValueUSD $ 25.99USD $ 20.99USD $ 24.99
ColorMetallic Blue/Stainless
Manufacturing CountryMade in China

Thermos has been a household name for years and is known by everyone.

It is actually one of the few items in the world that has become a genericized trademark. I can still remember the old soup Thermos we took on family outings: a simple canister with a click-on mug that would keep our food warm for about an hour or so.

The Thermos we know today may still carry the same name, but they made momentous strides in innovation since then.

Overall Aesthetics

The canisters and hydration bottle came in a dark blue/stainless color. The metallic color gave the Thermos containers a very modern look appropriate for the times.

Plastic is definitely long gone and the stainless steel double wall vacuum insulation is here to stay. They actually look so nice they could also become regular kitchenware products rather then a storage container in someone’s pack.

  • Thermos® double-wall vacuum insulation for maximum temperature retention, hot or cold
  • Unbreakable stainless-steel interior and exterior
  • Extra wide mouth is easy to fill, serve from and clean
  • Cool to the touch with hot liquids, sweat-proof with cold
  • Compact and insulated stainless-steel serving bowl
  • Full-size telescoping stainless-steel spoon
  • Capacity: 16 oz.
  • Dimensions: 3.7" diameter x 5.6" H
  • 7 hours HOT
  • 9 hours COLD
  • Thermos® vacuum insulation technology for maximum temperature retention
  • Unbreakable stainless steel interior and exterior
  • Hygienic push button sipper lid with locking ring
  • Sweat-proof design won't leave water rings
  • Comfortable rubber grip
  • Fits most automotive cup holders
  • Capacity: 18 oz
  • Dimensions: 2.5" W x 2.5" D x 10" H
  • 12 hours COLD
  • Thermos® double-wall vacuum insulation for maximum temperature retention, hot or cold
  • Unbreakable stainless-steel interior and exterior
  • Twist-and-pour stopper lets you pour without removing the stopper
  • Cool to the touch with hot liquids, sweat-proof with cold
  • Insulated stainless-steel serving cup
  • Capacity: 16 oz.
  • Dimensions: 3" diameter x 9.6" H

The canister and hydration bottles are lightweight and small. They pack well and make them suitable for any type of trip.

During my last backpacking trip I tested the 7 Hour heat retention of the Food Jar in the snow. The soup remained hot for about 6 hours, some of the heat escaped due to the constant opening and eating along the way, but overall the heat retained wonderfully.

Thermos Flask Hydration Bottle

Packing is extremely simple. Just drop in some hot or cold food items in the containers. Screw the cap on and it’s ready to go. To me, the Thermos containers are still a modern day marvel. These containers are great for families who like car camping as well. Just having hot food/drinks readily available for the kids is always a plus.

Not only is this great for long trips, but for the leisurely day or weekend hikes as well. The versatility of the canisters is what makes Thermos really shine. They have no specific niche, but are great in all areas.


Both the canister and hydration bottle were made of unbreakable stainless-steel interior and exterior.

I proceeded to put this specification to the test with a few drop tests.

Nothing extremely scientific, but while hiking I simply tossed the canisters off a hill (~20 feet) to a rocky outcrop. I then went down to inspect the damages. Besides a few scratches the entire canister was unscathed. Not a single dent or problem with any of the functions of the canister.

If there were any weak points to the bottle or canisters it would be the plastic tops. There is always a possibility of threading issues or cracking due to extreme temperatures changes (This is all speculation)

Thermos Food Jar

  • Availability of sizes. The Food Jar used in the review has a capacity of 16 ounces. 24 ounce and 48 ounces Food Jar’s are also available.
  • Lightweight and easy to pack
  • Affordable prices

  • Only the 16 and 17 ounce Food Jar’s are available in different colors. 24 ounces and up are only available in stainless steel.
  • Considered a luxury item by some backpackers.

Where to buy your Thermos flasks
  • Amazon (usually you can find the best prices here)
  • REI


The Food Jar is definitely great for the camping, weekend hikes or for the first meal out on an extended backpacking trip. The hydration bottle is also great everyday carry in any of those environments as well. Thermos continues to live up to their name as one of the best Food Jar makers in the industry.

Thermos will always have a place in history and in my pack. :-) It may be additional weight and may be considered a luxury by some backpackers, but to me it is an essential.

Nothing is more uplifting than warm food/drink in extremely cold weather. Especially if I can have it, without making a fire or setting up the stove to heat it up.

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About the author: JSO is a climber and hiker from Northern California. He's part of the group of athletes who regularly write gear reviews for Highball Blog. 

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  1. I want a thermos that will keep the tea hot during snowboarding session at -5, -10 degrees? What do you recommend?

    1. I think any good thermos can do that.

      You have to know that once you open it, the tea inside will get colder faster. So with each serving, you can expect it to be a bit less hot than last time.

      If it's really cold, you may want to have an insulating cover on the flask.


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