Best Vacuum Flask for Keeping Liquids Hot

Vacuum flasks are making a major comeback these days. Nineties kids remember that lunchbox thermoses were the way to be cool in elementary school!

Get the most colorful thermos you could find, fill it up with soup, and you’d be the coolest kid at lunch. Look, mom, no spoon!

Our neon thermoses may have got lost in the attic with our Lisa Frank lunchboxes, but vacuum sealed awesomeness is just as trendy today.

Now, we sip hot coffee all day long or take outdoor excursion Instagram photos with name-brand stainless steel mugs subtly placed the background. Don’t deny it!

Unlike SPLAT hair dye and nail wraps, though, trendy vacuum flasks aren’t all about the looks. If you’ve ever used a vacuum flask, you know that vacuum-seal technology is incredibly useful!

So whether you like being “in” or techie, you probably want the best vacuum flask you can find. Which should you get? Read on to learn about the best vacuum flasks for keeping liquids hot!

Comparison Table: Best Vacuum Flask for Keeping Liquids Hot

 Stanley
Our Best Pick
ThermosContigo
Heat Retention32 hours24 hours5 hours
LidScrew-top cupScrew-top cupPush-button
HandleYesYes           No
Ideal UseOutdoor, workOutdoor, daily activitiesTravel, work, driving
ColorBlue or GreenVariousOver 15 options
Styles1.1 to 2 quart40 ounce16, 20, 24 ounce
PriceCheck PriceCheck PriceCheck Price

Common Questions about Vacuum Flasks

What is the best material for keeping liquids hot?

There are a variety of materials that keep liquids hot. Unless you feel like drinking out of fiberglass or foam, stainless steel is the best way to keep your coffee hot.

One layer won’t do the trick, though—you’ll need two layers sandwiching a vacuum seal to keep things at temperature.

How long does water in a flask stay hot?

Depending on the flask you get, heat retention ranges from about six hours to about 24 hours. Some flasks can keep things decently warm for almost two days!

1. Thermos Stainless King 40-ounce Beverage Bottle

This is the classic vacuum-seal flask! Thermos makes an excellent hot beverage flask. Your warm beverage will stay hot for 24 hours in this flask. It looks sleek, and it works wonderfully.

One of the coolest features on this flask is the cap. It doubles as aseven-ounce cup, and it includes a pour-stopper. You can pour liquid into the cup without taking the lid off!

Then, you close the pour-stopper and remove the cup to sip mess-free. This is a win for anyone as klutzy as me!

If you’re going to be on the go for a while, this is a great hot-beverage flask to take. It doesn’t spill or leak, so you can throw it in your bag and go about your business.

Whether you’ll be pulling a long shift at work or backpacking in autumn, the Thermos flask will keep in equipped with hot coffee all day long

The Thermos vacuum-seal flask comes in four colors. You can choose from blue, black, cranberry, or stainless steel.

2. Stanley Classic Vacuum Bottle

The Stanley Classiv Vacuum Bottle is very similar to the Thermos flask above. It’s a good flask, but does it measure up? Let’s take a look.

The Stanley bottle is a little bit more expensive, but it doesn’t have as many features as the Thermos. The lid on this flask doubles as an 8-ounce cup.

However, it does not have a pour stopper. If the pour stopper is annoying to you, this could be good news.

This cup only comes in two colors: green or blue. If color isn’t important to you, you might not care. And in the long run, that’s only two fewer color options than you can get with the Thermos.

One benefit to this flask is the size variety. You can find a variety of sizes for this flask style. There’s a 1.1 quart version, as well as a 1.4 quart, 2 quart, 16 ounce, and 25 ounce version.

3. Contigo West Loop Vacuum Insulated Stainless Steel Travel Mug

The main difference between this flask and the others on our list is the lid. While both the Stanley and Thermos flasks have lids that convert to a cup, the Contigo flask comes with a push-button lid.

Depending on what you like, this could be a pro or a con. If you must have a cup with your Contigo, you can buy a cup version of the lid separately.

The Contigo is significantly less expensive than the Thermos or Stanley, but it’s not as effective at keeping things hot. Contigo estimates that hot beverages will stay at temperature for five hours.

This is a huge step down from our other two flasks! If all you need is a few hours, this might be a good choice, though, since it is a lot less expensive.

Although it doesn’t keep things hot for very long, the Contigo flask does have some benefits. The most important is the lifetime guarantee.

Less important but more obvious is the color choice. There are over 15 color options for the Contigo flask!

Final Verdict

It’s safe to say that we wouldn’t recommend the Contigo over the Thermos or the Stanley. Color choice is cool and a lifetime warranty is awesome.

However, if you’re looking for something to keep your liquids hot for a long time, Contigo West Loop isn’t it.

It’s harder to decide whether to choose the Thermos or the Stanley. In the end, though, the Stanley comes out on top. It keeps beverages hot for a longer time, and it is less expensive.

It’s smaller than the Thermos, and it doesn’t include a pour-stopper, but it does its job well for a reasonable price. If you want a flask you’re sure to love, go with the Stanley Classic Vacuum Bottle.

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