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Best Thermos Mugs

last updated Nov 07, 2018

When it comes to truly necessary items for the outdoors or for sports enthusiasts, a quality thermos bottle just might top the list. Whether you want to keep your coffee piping hot for your morning commute to the stream for getting breakfast or make sure your water stays cold even on the hottest summer day, thermos bottles are designed to keep your beverage, soup or food exactly the way you want it to be.

One of the most important things that you can do while enjoying the outdoors or sports activity is to stay properly hydrated. Whether you enjoy hot or cold drinks during your activities, thermos mugs provide a great method for keeping a source of hydration close at hand.

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Reviews Considered
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Products Evaluated
16
Products Evaluated
Last Updated: November 5, 2018
By Sarah Roth:

This list of thermal mugs has been put together to show you the best researched and reviewed insulated bottles on the market to keep your drinks and food hot or cold while on the go. A mug to keep your eye on is the Hydro Flask Wide Mouth. We love this addition because it is highly rated, affordable, keeps your drinks cold for 24 hours or hot up to 6 hours, and is durable and stylish.

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PictureProduct
Name
Rating
Shops
1
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
92.8
Materials
96%
Features
89%
Capacity
88%
Durability
98%
Price Comparison Last Updated (14.11.18)
$39.95
2
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
91.8
Materials
95%
Features
95%
Capacity
88%
Durability
89%
Price Comparison Last Updated (14.11.18)
$19.99
3
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
91.5
Materials
95%
Features
85%
Capacity
89%
Durability
97%
Price Comparison Last Updated (14.11.18)
$27.95
4
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
91.5
Materials
95%
Features
90%
Capacity
90%
Durability
91%
Price Comparison Last Updated (14.11.18)
$26.99
5
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
91.5
Materials
95%
Features
85%
Capacity
90%
Durability
96%
Price Comparison Last Updated (14.11.18)
$15.97
6
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
91
Materials
95%
Features
90%
Capacity
89%
Durability
90%
Price Comparison Last Updated (14.11.18)
$32.11
7
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
89.8
Materials
95%
Features
88%
Capacity
88%
Durability
88%
Price Comparison Last Updated (14.11.18)
$10.99
8
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
89.5
Materials
96%
Features
83%
Capacity
86%
Durability
93%
Price Comparison Last Updated (14.11.18)
9
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
88.8
Materials
95%
Features
84%
Capacity
85%
Durability
91%
Price Comparison Last Updated (14.11.18)
$31.52
10
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
87.5
Materials
94%
Features
83%
Capacity
85%
Durability
88%
Price Comparison Last Updated (14.11.18)
$19.97
In Depth Review Top 10
  • Hydro Flask Insulated Wide Mouth
  • Takeya Original
  • Hydro Flask Double Wall Vacuum
  • Camelbak Chute
  • Brimma Vacuum insulated
  • Avex Brazos Auto Seal
  • Lifesky Stainless Steel Sport
  • Zojirushi Tuff
  • Thermos Vacuum Insulated
  • Fijoo Stainless Steel Thermos
Table of contents
  • Criteria Used for Evaluation
  • Other Factors to Consider
  • Frequently Asked Questions

Top Ten Thermos Mugs

1. Hydro Flask Insulated Wide Mouth

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
92.8
Hydro Flask Insulated Wide Mouth
Materials
96
Features
89
Capacity
88
Durability
98
best offer for today
$39.95
Pros:

Double wall vacuum helps to keep things cold for 24 hours, hot for 6 hours

Slim design can fit just about anywhere

Surprisingly high capacity for the design

Cons:

A bit more expensive than other thermos mugs

Following close behind the other Hydro Flask on this list, this larger, wider mouth version is a great choice for those longer treks or longer days.

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Construction
Made of premium grade 18/8 stainless steel and BPA-free plastic, along with a powder-coat matte finish, this water mug is a great all around choice for those long days out on the trail. The double wall construction also helps to keep your beverage cold for the entire day, or your hot chocolate hot for nearly six hours. Add to that the wider mouth which makes adding things a breeze, and the overall light weight construction makes carrying it around a joy as well.

Carrying Ease

Although slightly larger than some thermos mugs on this list, this Hydro Flask does still offer the classic slim design that makes it easy to carry one handed. The lack of a handle or carrying strap, however is a bit of a deterrent for use.

Capacity

At 32 ounces, this thermos mugs offers a surprising large amount of capacity in its deceptively slim design.

Durability

Like many of the other thermos mugs in the Hydro Flask collection, this one boasts a fairly straightforward design that is resistant to the everyday dings and dents that an active person gets through life.

Price

This thermos mug ranges significantly in price, and can be a little on the expensive side. However, the quality that you’re paying for is well established.

Summary

If you’re looking for a thermos with a slim, easy to hold design that doesn’t sacrifice on capacity or thermal insulation, this is a solid choice.

2. Takeya Original

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
91.8
Takeya Original
Materials
95
Features
95
Capacity
88
Durability
89
best offer for today
$19.99
Pros:

Economically priced

Keeps beverages cold for 24 hours and hot for a respectable 12 hours

Twist off drinking cap helps to maintain seal to prevent leaks

Cons:

Lids can be hard to open

While this brand may not be the most well-known, they offer some serious thermal insulation and convenient features that make it a good all-around choice for those who are always on the go.

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Construction

Featuring the classic double wall construction that allows you to keep beverages hot for 12 hours or cold for 24, this thermo mug also features food-grade stainless steel materials and a spout that combines the versatility of a wide mouth with the easy pour features of a narrower one.

Carrying Ease

The narrow design makes it easy to fit just about anywhere, and the solid clip near the cap allows you to add on your favorite handle with relative ease.

Capacity

This thermos mug holds approximately 24 ounces of liquid, so it’s great for those day long excursions.

Durability

While the design of this mug is solid, and made from quality materials, it is not designed for repeated, and rugged outdoor use. However, with proper care and maintenance, there is no reason why it can’t handle what a weekend warrior can throw at it.

Price

This is probably one of the most economical choices when it comes to thermos mugs on this list.

Summary

While not the best choice for those who go all out in rugged or inhospitable terrains, the Takeya Originals brand is a fantastic choice for those who want a budget friendly alternative for those weekend hikes or camping trips with the family.

3. Hydro Flask Double Wall Vacuum

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
91.5
Hydro Flask Double Wall Vacuum
Materials
95
Features
85
Capacity
89
Durability
97
best offer for today
$27.95
Pros:

Slim, go anywhere design

Powder-coated outside for easy grip

Convenient size

Cons:

Handle may be difficult for people with larger hands

This is one of the most versatile thermos mug on the list. It offers a medium-sized mug that has a surprising capacity and ease of use, making it a great choice for use in your everyday life.

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Construction

Just like the rest of the Hydro Flask collection, this example features a quality 18/8 stainless steel construction and BPA-free lids and handles. This thermos mug also has a standard 1.81-inch opening which makes pouring from it a breeze. Add to that a powder coat finish on the outside, there is little chance of the mug slipping from your hands.

Carrying Ease

The slim design of this thermos mug makes it easy to fit just about anywhere, and the small handle at the lid is relatively easy to grip.

Capacity

At 21 ounces, this thermos mug is a great size for your daily commute or your morning coffee while camping.

Durability

Designed specifically for use in the outdoors and sports, the Hydro Flask has a rounded design which helps to protect it from the dents and dings that are liable to happen.

Price

While the price is a bit more expensive than some of the more budget-friendly choices on the list, it is still reasonably priced based on the quality and the workmanship of the mug. If you’re looking for quality, and you’re prepared to spend a few extra dollars, this one is a great choice.

Summary

The brand Hydro Flask is well known in the sporting and outdoor enthusiast communities for its quality construction, fun designs and their commitment to the environment. If you’re looking for a middle of the road priced mug that doesn’t sacrifice too much quality, this is the one to get.

4. Camelbak Chute

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
91.5
Camelbak Chute
Materials
95
Features
90
Capacity
90
Durability
91
best offer for today
$26.99
Pros:

Very sturdy construction

Designed for long term, rugged outdoor use

Camelbak has the reputation and experience to back up their product

Cons:

Specialization in outdoor use makes it somewhat impractical for every day use

When it comes to quality outdoor hydration, Camelbak is one of the most recognized brands based on their quality and innovation. However, the bulky size and specialized spout make it a little less versatile.

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Construction

The double-walled, stainless steel construction allows you to keep your beverages cold for the entire day, or keep your morning coffee hot until lunchtime. The snap-on angled spout is great for rapid drinking on the go, and the cap also seals tight to prevent leaks

Carrying Ease

Although most adults can carry this thermos easily with one hand, it is a bit bulky to carry in a bicycle mug cage or a car cup holder. Also, the lack of handle or included carrying case makes storing inside your backpack a necessity.

Capacity

At a 40 oz capacity, this is a great choice for multiple day treks or week long camping trips.

Durability

When it comes to outdoor equipment, Camelbak boasts one of the best reputation for durability on the market today. Not only does the stainless steel construction resist damage and deterioration, but the relatively straightforward design lends itself to frequent use in the most rugged of terrains.

Price

While not the most expensive choice we’ve come across, this choice does fall on the higher end of the price scale. However, if you can overlook its few faults, it is a very dependable choice that is great for the great outdoors.

Summary

The Camelbak Chute is a great choice if the time you spend in the great outdoors includes a more rugged and demanding terrain. However, for everyday use, there are more viable options available.

5. Brimma Vacuum insulated

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
91.5
Brimma Vacuum insulated
Materials
95
Features
85
Capacity
90
Durability
96
best offer for today
$15.97
Pros:

Ergonomic design makes it easy to carry

Screw-top lid makes it easy to keep liquids in

Narrow spout makes for an easy pour

Cons:

No handle or clip on makes storing in a bag tougher

Designed specifically for active individuals, the Brimma Vacuum Insulated Water Mug rounds out our list with a solidly constructed thermos mug that looks remarkably like a mug of soda. It’s a great way to disguise a more healthy option!

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Construction

As expected, this thermos mug offers double-walled vacuum construction with stainless steel materials both inside and out. Add to that the spill-resistant screw top lid, and you have a great choice that is both lightweight and durable for those who are always on the move.

Carrying Ease

The smaller size and ergonomic mug shape make this thermos mug easy to hold and easy to use. While the lack of handle or clip on makes attaching it to a backpack impossible, it’s slim design means it can fit just about anywhere.

Capacity

At 17 ounces, this mug offers a convenient size for personal, everyday use.

Durability

Not only is this thermos mug extremely light weight, but the design stands up easily to normal everyday use. While it probably won’t survive an expedition to Mount Everest, it will certainly serve well during a day hike or a simple camping trip.

Price

For individual use, this is one of the most budget-friendly options available on the market today.

Summary

While not ideally suited for outdoor use, the Brimma Vacuum Insulated Water is a good choice for individual, every day use.

6. Avex Brazos Auto Seal

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
91
Avex Brazos Auto Seal
Materials
95
Features
90
Capacity
89
Durability
90
best offer for today
$32.11
Pros:

One-handed operation

Auto-seal technology

Ergonomic design

Cons:

Only designed for cold beverages

Based on the features alone, this thermos mug by rights should be higher on the list, however, it is designed for only cold beverages, which doesn’t make it as versatile as the others featured here.

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Construction

This thermos mug boasts a number of construction features that make it a wonderful choice for camping, hiking, and even scaling in a more treacherous environment. The double vacuumed insulation keeps your beverage ice cold for up to 20 hours, and the auto-seal technology helps to prevent the drips and dribbles that can happen with strenuous movement. Add to that the easy one-handed operation, and this is a great choice at a great price.

Carrying Ease

The integrated clip on/carry handle makes keeping a hold on this thermos mug second nature. Add to that ergonomic design, and carrying it is no problem at all.

Capacity

At 24 ounces, this thermos mug offers a respectable capacity for those day long hikes or those meetings at the office that seem to go on forever.

Durability

There is nothing flimsy about this example on the list. Solidly constructed with stainless steel and a protective spout to help keep the cold in where it belongs even on the hottest of days. Also, the lid is top-rack dishwasher safe, which makes cleaning it and keeping it in good shape a breeze.

Price

Considering all the features included, and the relative ease of use, this mid-priced brand can be considered a bargain.

Summary

While only designed for keeping beverages cold, this thermos mug packs a lot of features that make it easy to use.

7. Lifesky Stainless Steel Sport

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
89.8
Lifesky Stainless Steel Sport
Materials
95
Features
88
Capacity
88
Durability
88
best offer for today
$10.99
Pros:

Quality food grade steel construction

Convenient size for car, backpack or bike

Double wall vacuum keeps liquids hot or cold for up to 12 hours

Cons:

Attached carbiner has been known to be faulty

Truth be told, it was a tough call between the Lifesky entry on this list and the winner of the Zojirushi. This thermos mug offers nearly everything you could want, and at a very reasonable price.

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Construction

The Lifesky sports mug offers 18/8 stainless steel construction that is food grade inside and out, so there are no worries about contamination. It also contains no BPA, so that plastic smell and possible health risks simple are not an issue. Plus with proper care, it can keep your beverages hot or cold for up to 12 hours.

Carrying Ease

This mug offers a fairly slim design, making it perfect to carry in a bicycle mug cage or in your car cup holder on your commute. However, the associated carabiner for carrying is not always reliable, so purchasing another carrying handle or bag may be prudent.

Capacity

At 20 oz, this thermos mug is a great size for those short day hikes or for your morning commute.

Durability

Based on its relatively simple design, the Lifesky offers great protection against leaks, and will resist most of the damage that is thrown at it. So take it on that long trek or into that hostile environment. Chances are it will take everything that you throw at it.

Price

If you’re looking for quality at a great price, you really can’t go wrong with this choice. The price is very economical, and can easily fit into just about any budget.

Summary

The Lifesky Stainless Steel Sports Water Mug offers a simple design that highlights quality construction, ease of use, and great thermal insulation. Save for the problematic carrying carbiner, this is a great choice for every day use.

8. Zojirushi Tuff

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
89.5
Zojirushi Tuff
Materials
96
Features
83
Capacity
86
Durability
93
best offer for today
Pros:

Quality Stainless Steel construction

32 ounce capacity is great for longer treks

Wide mouth

Cons:

Heat has been known to leak through the spout tip over time

When it comes to the ease of use, durability, and ability to keep your favorite beverage at the temperature you want, you can’t go wrong with this entry into the sports mug/thermos arena.

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Construction

Made from stainless steel construction inside and out, as well as the classic double-walled vacuum construction, the Zojirushi SJ-SHE10 offers superior thermal insulation keeping your cold beverages refreshing and your hot beverages soothing for hours on end. Add to that the easy to use push button stopper, the extra wide mouth – which can handle full size ice cubes-- and the collapsible handle and carrying strap, this is a great all around choice.

Carrying Ease

Let’s face it, when it comes to thermos mugs, you’re probably going to be using it on the go. This is where this particular example shines. The handle and strap offer a flexible and convenient way to carry it, whether by hand, or attached to a backpack or belt. Plus you don’t have to worry about leaving things behind, since everything is securely attached.

Capacity

At 32 ounces, this thermos mug is well-equipped to keep you hydrated on that long hike, or handle your coffee demands during a grueling day at work.

Durability

Because of it’s solid stainless steel construction, the Zojirushi SJ-SHE10 resists rust and staining, which makes it last for a very long time. As long as it is properly cared for, there is no reason why this thermos could be your favorite for years to come..

Price

While not the most inexpensive brand on the market, this thermos mug is reasonably priced for the serious outdoor enthusiast and workday warrior.

Summary

Zojirushi is quickly becoming known as a quality provider of thermos mugs to the public and with good reason. Based on their quality construction, no nonsense design, and common sense features, this one is a great investment when it comes to quenching your thirst.

9. Thermos Vacuum Insulated

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
88.8
Thermos Vacuum Insulated
Materials
95
Features
84
Capacity
85
Durability
91
best offer for today
$31.52
Pros:

Solid stainless steel construction

Easy to use pour spout and cup that doubles as a lid

Very respectable thermal insulation

Cons:

Simplistic design lacks many of the conveniences of other mugs

Built to last, and standing on the shoulders of a long-standing reputation, this thermos mug offers solid construction and impressive thermal retention in a convenient size.

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Construction

The double-walled stainless steel construction offers the ability to keep cold drinks refreshing for 24 hours, and hot beverages soothing for nearly 18. The twist and pour stopper lets you control the flow of the liquid, and the built in cup that doubles as a lid is a convenient way to portion out your servings.

Carrying Ease

While the design is relatively slim, and can fit in most bags or backpacks, the lack of handle or place to attach one makes it necessary to invest in a carrying bag or sling for ease of transport.

Capacity

At 25 ounces, this thermos has a great size for person, daily use

Durability

Touted to be virtually unbreakable, the solid double wall steel construction has certainly been shown to hold up to normal wear and tear quite well.

Price

The price of this thermos mug sits on the higher end of the budget-friendly section, and for the price you get a very reasonable quality product.

Summary

The Thermos brand has long been known for their quality products, and this is a great example. While it doesn’t have some of the features that make using it more convenient, it is still a solid and respectable product.

10. Fijoo Stainless Steel Thermos

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
87.5
Fijoo Stainless Steel Thermos
Materials
94
Features
83
Capacity
85
Durability
88
best offer for today
$19.97
Pros:

Food grade stainless steel construction

Slim design allows it to fit just about anywhere

Keeps cold beverages cold for 24 hours, hot for 8 hours

Cons:

No handle or strap makes getting transport tougher

If you’re looking for a stylish thermos mug choice that won’t cramp your style either in the great outdoors or behind the desk, this one is a great choice.

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Construction

As the name suggests, this thermos mug is constructed of high-grade stainless steel, so you won’t have to worry about plastic changing the taste of your favorite beverage. The double-walled vacuum offers fantastic thermal insulation, and boosts 24 hours for your cold beverages, and an impressive 8 hours for your hot ones. Add to that the convenient cup, and slim design, this is a great choice for camping, hiking and all around use.

Carrying Ease

Because of its slim design, the Fijoo Stainless Steel Thermos mug fits, just about anywhere. That being said, it is missing a convenient handle, so having a carry case or sling is a great addition.

Capacity

This thermos mug actually comes in two different capacities – a small version at 17 ounces, or a larger 32 ounces. Both, however, keep the slim, go-anywhere design.

Durability

Because of its rounded, simple design, and food-grade stainless steel construction, this mug can handle the strain of every day use, even if your average day includes climbing through the mountains.

Price

Another great feature of this thermos mug is the price. Somehow the people at Fijoo have found a way to provide great quality at a very economical price.

Summary

If you’re looking for a no-nonsense thermos mug that is designed to go anywhere at a budget-friendly price, the Fijoo Stainless Steel Thermos mug is a great choice.

Criteria Used for Evaluation

Materials

The first criteria that we considered in searching for the top ten thermos bottles were the overall quality of construction and the materials used. We knew that in order to pass our standards, the bottles need to be constructed of a high-quality material, have a superior workmanship and quality, and also be able to withstand the rigors of your use. Add to that, the materials used also need to be safe. After all, the contents of the bottles are going to be used in the consumption process. The last feature desired was contamination.

Thankfully, and expectantly, every example on our list met these criteria with flying colors. The materials used primarily consisted of food-grade stainless steel or better, BPA-free plastics, and construction styling that made it very difficult for microbes or germs to be spread with proper hygiene and use.

Features

Let’s face it; it doesn’t matter how spectacularly a thermos mug is constructed if it doesn’t get used right? Well, that’s why the ease of use was another important factor we considered. In order to determine how easy it was to use, we considered the overall size of the mug, whether or not there was any handle present, if the bottle had a no-slip grip or ergonomic design, and whether or not the spout allowed for easy pouring, drinking, or the addition of materials such as ice cube.

While many of the examples presented met most of the criteria presented, very few, such as the Zojirushi and the Life sky met all our demanding ones. That being said, some like the Camelbak chose to specialize more, meaning that they excel in certain areas more, such as ruggedness and long-term use. Each one, however, was shown to be perfectly adequate for every use by the average person.

Capacity

Of course, another important factor that we considered was the size to capacity ratio of the bottles. In most cases, the volume held by the bottles were pretty close to their overall size. This means that for the most part, a person using these bottles would get the most fluid for their money as it were.

Durability

When it comes to the great outdoors and the people that love it, how long a piece of equipment lasts is an important factor to consider. Thermos bottles, of course, are no exception. Thankfully with the standard stainless steel materials used, and the quality construction, pretty much every example on our list is built to last.

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Food needs liquid

If you are planning on storing some food in your thermos for lunch or a quick snack while on the go, remember that the only way to keep your food hot is to have a little liquid in the thermos with your food. That is why soups are the best thing to store in your thermos for lunch, as it will be able to stay warm all day long.

Other Factors to Consider

Value

Truth be told, for many people, the overall price of the thermos bottle is perhaps one of the most important considerations they take into account. These bottles range in prices of a decent lunch for one all the way up to a five-course meal. Thankfully, there are good contenders in nearly every price category imaginable. So whether you are looking for something that is a little more budget friendly, or you are willing to spend a few more dollars, chances are you’ll find a quality choice in this list.

Use

High-quality thermos bottles come in a myriad of different shapes, sizes, and styles. In fact, there is probably one that is just perfect for every outdoor enthusiast out there. However, with so many choices on the market, it can be a little daunting to find the right one for you.

One of the first things to consider is what your overall lifestyle is like. Are you an active person who spends more time in the great outdoors than inside? Do your outdoor adventures take you to far-flung places for days at a time? If that’s the case, something like the Zojirushi, the Camelbak, or the Avex Brazos may be the best choice for you. However, if you’re more of the weekend warrior type, who is always on the go, something with a slimmer profile and size such as the Life sky or Tayeka might be more your speed.

Frequently Asked Questions

q: How should I care for my thermos mug or vacuum flask?
a:

In most cases, the most important thing is to make sure that you clean your thermos bottle on a regular basis, specifically after each use. Most manufacturers recommend hand washing, some of them to allow for use of the top-rack of a dishwasher for some parts.

In most cases, a simple rinse with water after each use and a wipe with a damp sponge can be all you need out in the field. Once you get home, take the thermos apart completely and wash in hot, soapy water. Make sure to rinse the soap away completely, and dry the thermos thoroughly. Doing so ensures that the seals are maintained, and helps to prevent leaks from occurring.

It’s also a good idea to regularly inspect the gaskets, seals, and smaller parts for wear and tear and replace them when needed. Finally, make sure that the thermos bottle isn’t put through too much abuse.

q: What is this BPA that I Keep Hearing About?
a:

BPA stands for Bisphenol A. It’s an industrial chemical that has often been used in plastics and resins since the 1960s. While it was originally thought to be safe for human consumption and use in food grade materials, more recent studies have changed our understanding.

It is now indicated that this chemical may affect the brain, behavior of individuals, and the prostate glands of fetuses, infants, and young children. Studies have also indicated a possible link between BPA and high blood pressure. Given the mounting evidence of problems with BPA use, many thermos bottle manufacturers are starting to move away from using it in their products

q: How Does a Thermos Bottle Actually Work?
a:

A thermos bottle helps to keep the temperature of your beverage inside cold or hot because it is insulated against heat loss (or heat gain) through the use of double wall construction. Essentially the thermos bottle works in much the same way as the double paned windows of your house. They use the air that is trapped within the two walls of stainless steel to help minimize the transfer of heat.

This concept is highly innovative and has been with us for a very long time and innovative ideas to come up with better do exist but the traditional style remains very popular. The outer skin is usually a durable flask coat which can take knocks but the inner skin is fragile and if damage does occur it is usually the inner that breaks and this renders the flask useless. Depending on the design it is possible to replace a broken inner.

q: What is the best size Thermos Bottle for Me?
a:

The answer to that depends greatly on what you’re going to use the thermos bottle for. If you’re going to be using it for daily use, a smaller size may be more than enough. If you want to use it on longer outdoor excursions, a larger, more robust size may be in order.

If we took a technical stance to this question we would suggest you consider age and size, a larger person working outside all day will most certainly want a flask which can carry a good volume of liquid. A school student would take along a medium sized flask because he/she is only looking to drink at lunch hour or during a break from classes. There are mega flasks which are very good for group picnics and these flasks will carry a large volume of liquid which is generally enough for an averagely sized family.

q: What can I do to make sure I get the most out of my thermos?
a:

If you want to make sure that your cold drink stays ice cold, or your warm drink can still warm your bones after a few hours, there is a bit of preparation that you need to do. Thankfully, it’s a fairly simple process. Depending on what your desired temperature is, you’ll need to either pre-heat or pre-chill the thermos bottle. First, if you want to pre-heat the bottle, open it up and pour in some boiling water.

Let it stand for a few minutes. This allows the heat of the boiling water to radiate into the trapped air, heating it up slightly. That way, any heat lost from your drink will be replenished by the heat trapped in the double wall construction. Conversely, if you want to make sure your drink stays cold, allow very cold water to sit in the thermos for a few minutes to chill the air or add ice cubes to the thermos prior to use.