The 5 Best Thermoses in 2021 Reviewed

Is there anything better than a hot drink on a cold day exploring the great outdoors? For us, that first sip of hot coffee or chocolate during a break on a cold, grueling hike is hard to beat. That is exactly why we rate high-quality thermos as an essential piece of gear for camping and/or outdoor enjoyment. Not only can thermoses keep your drinks warm, but they also aid in keeping cold drinks chilled. So, whether you want to enjoy your coffee hot, or your cold water refreshingly crisp, investing in a good thermos is always a great idea!

But finding a good thermos can be a challenge, as the accessory needs to tick a lot of boxes. You need a thermos to be leak-proof, lightweight, spill-proof, and – most importantly – offer great heat retention/cold retention. Though there are other buying factors to consider, for example, is the thermos dishwasher safe for quick cleanup, the design ability to insulate should always be the top priority. 

In a hurry? Here’s the test winner after 10 hours of research:

Sale
Stanley Classic Vacuum Bottle 1.1QT Hammertone Green
  • KEEP IT HOT OR COLD: Our Stanley Classic Vacuum Bottle is made with superior insulation that keeps liquids (soup, coffee, tea) hot or cold drinks cool for up to 24 hours It’s also made with BPA-free...

And here’s an overview of the best thermoses on the market today:

Preview
Stanley Classic Vacuum Bottle 1.1QT Hammertone Green
THERMOS Stainless King Vacuum-Insulated Beverage Bottle, 40 Ounce, Midnight Blue
Zojirushi SM-SA36-BA Stainless Steel Vacuum Insulated Mug, 20-Ounce, Slate Gray
YETI Rambler 14 oz Stainless Steel Vacuum Insulated Mug with Lid, Black
Hydroflask, Graphite Flex Cap Wide Mouth 32oz, 1 Count
Title
Stanley Classic Vacuum Bottle
Thermos Stainless King Beverage Bottle
Zojirushi Stainless Steel Mug 
YETI Rambler Insulated Mug
Hydro Flask Thermos Bottle 
Capacity
32 oz
40 oz
20 oz
14 oz
32 oz
Weight
1.7 lb
1.4 lb
0.5 lb
0.95 lb
1 lb
Price
$19.82
$38.94
$29.99
$37.90
$49.90
Preview
Stanley Classic Vacuum Bottle 1.1QT Hammertone Green
Title
Stanley Classic Vacuum Bottle
Capacity
32 oz
Weight
1.7 lb
Price
$19.82
Details
Preview
THERMOS Stainless King Vacuum-Insulated Beverage Bottle, 40 Ounce, Midnight Blue
Title
Thermos Stainless King Beverage Bottle
Capacity
40 oz
Weight
1.4 lb
Price
$38.94
Details
Preview
Zojirushi SM-SA36-BA Stainless Steel Vacuum Insulated Mug, 20-Ounce, Slate Gray
Title
Zojirushi Stainless Steel Mug 
Capacity
20 oz
Weight
0.5 lb
Price
$29.99
Details
Preview
YETI Rambler 14 oz Stainless Steel Vacuum Insulated Mug with Lid, Black
Title
YETI Rambler Insulated Mug
Capacity
14 oz
Weight
0.95 lb
Price
$37.90
Details
Preview
Hydroflask, Graphite Flex Cap Wide Mouth 32oz, 1 Count
Title
Hydro Flask Thermos Bottle 
Capacity
32 oz
Weight
1 lb
Price
$49.90
Details

To help you navigate your way towards the best thermoses on the market, we’ve created this handy Best Thermos overview. We’ve already done all the hard work for you, pre-selecting thermoses that get the job done in the style. Discover our top picks below… And get inspired to upgrade your gear with a stylish, functional, and quality thermos! 

Best Thermos – Overview

 


 

Stanley Classic Vacuum Bottle

Sale
Stanley Classic Vacuum Bottle 1.1QT Hammertone Green
  • KEEP IT HOT OR COLD: Our Stanley Classic Vacuum Bottle is made with superior insulation that keeps liquids (soup, coffee, tea) hot or cold drinks cool for up to 24 hours It’s also made with BPA-free...
The Stanley Classic Vacuum Bottle is a heavy-duty, highly-durable thermos that many outdoor enthusiasts swear by. The brand behind the design, Stanley, has been a go-to name for quality thermoses and cooking year for over 100+ years. 

When inventor William Stanley Jr. created a thermos in 1913 that combined vacuum insulation with the strength of steel, bundled in one portable silhouette. Since the invention of the Stanley thermos, the steel design has been upgraded and evolved according to the highest quality standards and latest techniques. Resulting in a solid, stainless steel silhouette that can withstand even the toughest of outdoor scenarios.

The Stanley Classic Vacuum Bottle is available in various sizes, allowing you to pick the perfect capacity, based on your needs. The Stanley Classic Vacuum Bottle is currently listed on Amazon in a 2 QT, 1.4 QT, 1.1 QT, 25oz, and 16oz version. Do note that the number of hours each thermos can keep drinks at temperature depends on the sizing. For example, the 1.1 QT – as highlighted in this overview – keeps hot drinks warm up to 24 hours, cold drinks chilled up to 24 hours and drinks iced up to 120 hours. We think this is already more than sufficient for most campers, hikers, and outdoor enthusiasts. However, if you want a thermos that offers even better insulation, you may want to consider sizing up your Stanley Classic Vacuum Bottle. For example, the large capacity 2 QT thermos keeps drinks hot/chilled up to 32 hours, and iced up to a whopping 160 hours. 

Double-wall Vacuum Construction

The double-wall vacuum Stanley Classic gets its durability from the top-grade, 18/8 stainless steel used in its construction. The entire thermos is made of 18/8 stainless steel components, making it fully corrosion-resistant. The thermos is finished with a classic Hammertone powder coating, which offers extra resistance to scratches and abrasions. The thick outer steel shell can take a beating without losing performance, making this the perfect thermos for high-intensity outdoor activities such as climbing, and biking. 

Another perk is that the design’s clever insulated lid doubles as 8oz/236mL cup – allowing you to sip in style from a coffee mug, without having to pack a spare one. The wide mouth opening of the vacuum thermos makes it easy to clean and is large enough to fill the thermos with ice in case you want to keep your chill. Leakproof, dishwasher-safe and fully package: the Stanley Classic Vacuum Bottle is simply a winning formula.

Good to know: The Stanley Classic Vacuum Bottle even comes with a ‘Lifetime Warranty’ by the manufacturer. In detail, the Stanley Classic Vacuum Bottle is warranted to be free from any defect in workmanship or materials and to be thermally efficient. Meaning that if you have any issues with manufacturing defects on your double-wall vacuum thermos, the brand will find a solution to guarantee your satisfaction. 

Pro

  • Double-walled insulation
  • Lid doubles as a cup
  • Hammertone powder coating
  • Stainless steel
  • Lifetime Warranty
  • Various sizings available

Con

  • Heavy
  • Slightly pricey

 


 

Thermos Stainless King Beverage Bottle

THERMOS Stainless King Vacuum-Insulated Beverage Bottle, 40 Ounce, Midnight Blue
  • Made with Thermos patented vacuum insulation for maximum temperature retention, hot or cold
Another firm contender for the ‘Best Thermos’ title is the Thermos Stainless King. This style is similar in style as the Stanley Classic Vacuum and is also manufactured by a renowned brand: Thermos. For over 110-years, Thermos has been a leading manufacturer or thermoses, being the first brand to introduce the double-wall vacuum technology of heat retention over a century ago. 

The thermos vacuum insulation technology may sound complicated but in practice, it’s relatively simple. The double-walled construction of the thermos means the manufacturer has created an airless space between two walls (the interior and exterior). This barrier or air helps slow down the natural process of convection, a.k.a. the transfer of heat. Ensuring the liquid inside stays cool or warm, whilst the exterior of the bottle doesn’t heat or chill.

The Thermos brand offers various types of thermoses, but one of the most popular and top-rated options remains the Thermos Stainless King: a 40oz beverage bottle made of top-grade stainless steel. The Thermos Stainless King is currently available on Amazon in 5 stylish colors: Army Green, Matte Black, Silver, Cranberry Red, and Midnight Blue. Enabling you to mix and match it with the rest of your outdoor gear if desired. 

Known for their durability, spill-proof and leak-proof silhouettes, and high-quality standard, Thermos is a very trustworthy choice for outdoor gear. Giving you the peace of mind you’re buying from an expert brand, instead of risking buying a fluke or dupe product that fails to insulate your drinks as needed.

Vacuum Insulation Technology

The Thermos Stainless King 40 Ounce Beverage Bottle is made with Thermos’ special patented vacuum insulation technology for maximum temperature retention. The design can keep your liquids hot or cold for up to 24 hours. The exterior stainless steel silhouette remains comfortable to touch, without condensation or heating up. The style’s generous 40-ounce capacity should be more than sufficient for most hikers and adventurers, though do note: when filled to the max, this solid design will weigh you down quite a bit. 

Just like the Stanley Classic as listed above, the Thermos Stainless King also has your coffee mug needs covered. The lid doubles as an insulated serving cup. Whilst the easy to use twist-and-pour function allows you instant access to your coffee or water, without having to move the stopper. 

Pro

  • Double-walled insulation
  • Lid doubles as a cup
  • Large capacity
  • Stainless steel
  • Instant twists-and-pour function
  • Available in multiple colors

Con

  • Slightly heavy for backpacking
  • Slightly pricey

 


 

Zojirushi Stainless Steel Mug 

The Zojirushi Stainless Steel Mug may be slightly lesser known than the Stanley and Thermos brands, as listed above, but that doesn’t mean it’s not worthy of your attention! The Zojirushi SM-SC60HM Stainless Mug is one of the highest-rated thermoses on Amazon, with over 6000 positive reviews. Yes, that is not a typo, over 6000 others have given the style a big thumbs up on value, insulation, quality, and durability. Assuring you that you’re buying a product that should live up to expectations.

Do note that there are some variations in the Zojirushi thermos mugs and bottles available via Amazon. The thermal mug/flash as pictured can be ordered in 15+ colors, and 3 sizings: 12-ounce, 16-ounce, and 20-ounce. For this review, we’ve chosen to list the Slate Gray-colored 20-ounce version, once of the brand’s most popular options.

What makes this thermos different from the previously listed Stanley Classic and Thermos King designs, is that the silhouette enables you to drink straight from the mug via an ergonomic wide-mouth opening. The mouthpiece comes with a built-in air vent to allow the liquid to flow out smoothly, without gushing or overflowing when poured. The lid design of the thermos comes with a secure safety lock function to prevent it from opening on the go, minimizing the chance of spillage and leaks. 

The Zojirushi Stainless Steel Mug uses vacuum insulation to keep drinks hot or cold for extended periods. Though the exact various, consumers report drinks to retain temperature up to 24 hours. Do note however that Zojirushi only lists insulation details as: ‘heat retention: 190 Degree at 1 hr / 163 Degree at 6 hrs’, and ‘cold retention: 46 Degree at 6 hrs’. That said, thousands of 5-star Amazon reviews confirm the design can keep water hot or ice-cold all day long. So, we think you shouldn’t worry about its ability to insulate. If you don’t want to take any risks, choose the Stanley Classic or Thermos King instead, as these brands do have clearer indications about the number of hours their design retains temperature. 

BPA-free and lightweight

The Zojirushi Stainless Steel Mug is made of BPA-free plastic and quality stainless steel. Its steel silhouette is surprisingly lightweight, thanks to innovative new production techniques used by the manufacturer. The total mug only weighs 8 ounces and should fit most cup holders/car cup holders, making it the perfect travel mug for your morning commute. The design comes with an easy-to-clean nonstick interior, whilst the stopper also disassembles for thorough cleaning. 

Do note that the Zojirushi Stainless Steel Mug is more of a flask-style than a traditional coffee mug. And unlike the previous two products on this list, the lid does not double as a cup. The streamlined, sleek design also lacks a handle, so if you’re looking for a solid, easy-grip, you may want to choose a different thermos instead. That said, overall the Zojirushi Stainless Steel Mug is a great value, simple yet chic choice to enjoy your beverages hot or cold. 

Pro

  • Double-walled insulation
  • Budget-friendly
  • BPA-free plastic
  • Lightweight
  • Great for commute/cup holders
  • Built-in mouthpiece

Con

  • No handle
  • No cup included
  • Moderate insulation

 

YETI Rambler Stainless Steel Vacuum Insulated Mug

YETI Rambler 14 oz Stainless Steel Vacuum Insulated Mug with Lid, Black
  • The YETI Rambler 14 oz Mug is the toughest, most over-engineered camp mug out there
When it comes to the best coffee thermoses, the YETI Rambler Stainless Steel Vacuum Insulated Mug is pretty much as good as it gets. This highly-rated thermos mug offers maximum durability and insulation, with a convenient capacity of 14 fl oz.

The quality YETI Rambler Stainless Steel Vacuum Insulated Mug is made of top-grade 18/8, corrosion-resistant stainless steel. The silhouette is coated with a stylish DURACOAT™ Color paint finish. This special coating helps to prevent the color from fading or peeling, and provides additional protection against scratches and/or abrasions. The exterior of the thermos coffee mug is also condensation-proof, ensuring your hands stay dry and your grip solid.

The YETI Stainless Steel Rambler Mug uses double-wall vacuum insulation. Whether you use it for steaming hot coffee or refreshing cold water: its double-wall air-pocket helps keep your drinks at temperature for hours. Do note, this design is not a heavy-duty thermal flask. Instead, we’d rate this as the perfect choice for your morning commute or a hot drink around the campfire. If you’re looking for a thermos that closely resembles a coffee mug, with the bonus of vacuum insulation, this stainless steel travel mug may be your perfect match. The YETI Rambler Stainless Steel Vacuum Insulated Mug comes with an ergonomic grip for easy handling and includes a sturdy transparent lid. Another perk is that the built-in grooves on the bottom help it stack perfectly on top of another YETI mugs. Saving space in your backpack or camp kitchen, and allowing secure storage during transport.

The perfect thermos coffee mug

Amazon consumers rate the YETI Rambler Stainless Steel Vacuum Insulated Mug as a premium choice for enjoying hot and cold drinks. The design receives top-marks for its quality construction, durable and sturdy feel, ideal sizing, and ability to keep your drinks warm or chilled for hours. Thousands of 5-star Amazon reviews are a testimony that this stainless steel mug lives up to the high-quality standards YETI – a renowned brand in outdoor gear -is known for. So, if you’re looking for a thermos mug by an expert brand that delivers on all front: meet the Rambler.

Do note that the YETI Rambler Stainless Steel Vacuum Mug is not the most lightweight option (approximately 16oz with lid). Also, it is slightly more expensive than other stainless steel camping mugs and thermoses on the market. That said, with this product, you know you’re receiving an authentic, genuine product designed by outdoor enthusiasts, for outdoor enthusiasts, which makes it worth the splurge.

Pro

  • Double-walled insulation
  • Includes lid
  • Stainless steel
  • Over 2000+ positive reviews
  • Multiple colors available

Con

  • Not ideal for moving around
  • Relatively expensive for a coffee mug

 


 

Hydro Flask 32oz Water Bottle 

The Hydro Flask 32oz is the number one best-seller in water bottles on Amazon, but don’t be fooled: this insulated style is also a fantastic thermos for hiking, backpacking, and camping. It can keep water cold up to 24 hours, but also liquids warm up to 6 hours. The double-wall vacuum bottle is made of solid, 18/8 stainless steel, durable enough to withstand any outdoor scenario. 

When you’re hiking a trail, or simply enjoying a leisurely picnic in nature, there’s nothing better than a cold sip of refreshing water, or a hot cup of coffee. And that is where the Hydro Flask comes in handy. With a very generous 32oz capacity, it is large enough to provide enough hydration for longer trips, whilst its TempShield Insulation technology allows your beverage to maintain its perfect temperature for hours.

The flask itself is designed for maximum comfort and convenience. The Hydro Flask water bottle has a special powder coat, providing a solid, slip-free grip. This coat prevents condensation from forming on the outside, meaning no wet backpacks or slippery situations. The flask’s cap and handle are constructed with stainless steel pivots and a flexible strap, allowing for easy carrying, or attachment to a day pack.

Fits backcountry water filters

Also good to know, according to the manufacturer, the 32oz Hydro Flask thermos bottle fits most backcountry water filters, allowing you to also use it in combination with your existing camping gear. If the 32oz capacity is too large for your needs, there is also an 18oz Hydro Flask option available. And if 32oz is too small, you’ll be pleased to know there are also 40oz and a 64oz Hydro Flask variations, accessible in the same product listing on Amazon. 

The Hydro Flask 32oz is available in nearly 20 colors, ranging from neutrals such as Classic Black to bright and vivid hues like Flamingo Pink and Lemon Yellow. With a whopping 7000 5-star reviews, the Hydro Flask is a top-rated choice for hydration on the go. That said, we wouldn’t rate it as the ‘Best Coffee Thermoses’ – but when it comes to a thermos for cold water: this handy drinking bottle is a top-contender. It may lack a bit of insulation to keep drinks warm (6 hours is significantly less than other, heavy-duty thermoses such as the Stanley Classic). However, if you’re looking for a bottle to keep your water or liquids cold all day long, its 24-hour cold retention ability should be more than sufficient!

Pro

  • Streamlined design
  • Available in 20+ colors
  • Stainless steel
  • Double-wall vacuum
  • 7000+ reviews with 5-stars
  • Ideal for keeping drinks cold

Con

  • Expensive for a water bottle
  • Not the best as a hot liquid thermos
  • No cup included

 

 

 

Verdict

Which is the ‘Best Thermos’ for you fully depends on where, when, and how you plan to use it. As you’ve discovered, thermoses come in all shapes and sizes, and there isn’t a one-design-fits-all solution that reigns supreme. The good news is that the big diversity on the market does mean there’s a perfect match for every preference, big or small, with handle or without.

Rest assured, you can’t go wrong with any of the 5 products in this Best Thermos overview. Each ranks highly in Amazon user-reviews on functionality, value, durability, quality, and ease-of-use. If you’re looking for a type of insulated coffee mug thermos, you’ll love the YETI Growler. If you have a die-hard adventurer that only wants the very best, heavy-duty thermos with outstanding insulation abilities, you may be better matched with the Stanley Classic or Thermos King.

Whichever product you choose, one thing is certain: it’s a worthwhile investment to keep your cool, or bring the heat, to any outdoor adventure. Cheers!

Winner

Preview
Stanley Classic Vacuum Bottle 1.1QT Hammertone Green
Title
Stanley Classic Vacuum Thermos Bottle
Price
$19.82
Rating
-
Details
Preview
Stanley Classic Vacuum Bottle 1.1QT Hammertone Green
Title
Stanley Classic Vacuum Thermos Bottle
Price
$19.82
Rating
-
Details

If we had to pick a winner, we’d spend our money on the Stanley Classic Thermos. Not only does it offer outstanding insulation, but it’s also solidly constructed to handle the toughest of outdoor scenarios. Scratches, scrapes, or even drops: this sleek thermos is built solidly enough to retain its insulation ability. The Stanley Classic is available in various sizings, but the 1.1 QT is most popular. Large enough for plenty of coffee or cold water, yet small enough to carry in a pack without getting weighed down too much. That said, the option to mix and match sizes is a plus, as it allows you to find the ideal capacity for your needs. The 1.1 QT keeps liquids warm or cold up to 24 hours and iced to a whopping 120 hours: more than sufficient for most campers. Paired with a sleek Hammertone finish, ergonomic carrying handle, and lid that doubles as a cup, the Stanley Classic is a winning formula.

 

 


Recap

 

Preview
Stanley Classic Vacuum Bottle 1.1QT Hammertone Green
THERMOS Stainless King Vacuum-Insulated Beverage Bottle, 40 Ounce, Midnight Blue
Zojirushi SM-SA36-BA Stainless Steel Vacuum Insulated Mug, 20-Ounce, Slate Gray
YETI Rambler 14 oz Stainless Steel Vacuum Insulated Mug with Lid, Black
Hydroflask, Graphite Flex Cap Wide Mouth 32oz, 1 Count
Title
Stanley Classic Vacuum Bottle
Thermos Stainless King Beverage Bottle
Zojirushi Stainless Steel Mug 
YETI Rambler Insulated Mug
Hydro Flask Thermos Bottle 
Capacity
32 oz
40 oz
20 oz
14 oz
32 oz
Weight
1.7 lb
1.4 lb
0.5 lb
0.95 lb
1 lb
Price
$19.82
$38.94
$29.99
$37.90
$49.90
Preview
Stanley Classic Vacuum Bottle 1.1QT Hammertone Green
Title
Stanley Classic Vacuum Bottle
Capacity
32 oz
Weight
1.7 lb
Price
$19.82
Details
Preview
THERMOS Stainless King Vacuum-Insulated Beverage Bottle, 40 Ounce, Midnight Blue
Title
Thermos Stainless King Beverage Bottle
Capacity
40 oz
Weight
1.4 lb
Price
$38.94
Details
Preview
Zojirushi SM-SA36-BA Stainless Steel Vacuum Insulated Mug, 20-Ounce, Slate Gray
Title
Zojirushi Stainless Steel Mug 
Capacity
20 oz
Weight
0.5 lb
Price
$29.99
Details
Preview
YETI Rambler 14 oz Stainless Steel Vacuum Insulated Mug with Lid, Black
Title
YETI Rambler Insulated Mug
Capacity
14 oz
Weight
0.95 lb
Price
$37.90
Details
Preview
Hydroflask, Graphite Flex Cap Wide Mouth 32oz, 1 Count
Title
Hydro Flask Thermos Bottle 
Capacity
32 oz
Weight
1 lb
Price
$49.90
Details

 

 

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Samantha Bos

Samantha Bos

Samantha is an avid outdoor enthusiast who loves exploring the great unknown. She’s traveled all across the globe to sample nature’s delights. And her travels have taken her to all corners of the world: from hiking the famous Inca Trail in Peru to ice-hiking on glaciers in Alaska. Besides hiking, Samantha likes to challenge herself with all kinds of outdoor activities. She doesn’t shy away from testing her limits. For example, navigating Grade 5 rapids whilst whitewater rafting in New Zealand, and avoiding close-encounters with bird-eating spiders and poisonous plants in the Australian rainforest. Currently based in Manhattan, New York, she’s traded in the real jungle for an urban jungle. But she tries to get out and explore nature in the surrounding Hudson Valley, Catskills, and Harriman State Park areas as often as she can. She shares her knowledge of hiking, backpacking, and outdoor activities in handy ‘Best of’ overviews. Bundling the best-value, top-rated products that will no doubt make every reader a ‘happy camper’.