Best Thermos Flask? UK Vacuum Flask Reviews

What is the Best Thermos Flask? UK Vacuum Flask Reviews

Flasks are exceptionally useful when you are out hiking or camping, especially in the winter months.

They are there to keep your coffee and soup nice and warm so that you can enjoy it when you finally get a moment to rest.

 Of course, it’s not always easy to find the right one. In this guide, we have gathered thermos flask reviews in order to find the best thermos flask or best vacuum flask for you. Take a look and see if the one for you is listed here.​​​How to Choose a Flask

There is a huge range of flasks available for purchase, so it’s not always easy to decide which one is going to be right for you.

In this section, we give some advice about choosing the right flask for you, as well as a few things to look for in the next one. All of this will help narrow down your search for the perfect thermos flask.

The first thing you need to do is ask yourself what purpose the thermos flask will serve. Are you planning on taking it with you when you go hiking or camping?

Do you want hot food and drinks on your trip or are you not bothered by it? Answering these questions is important when it comes to moving on and finding the right flask.

Is the thermos for food or beverages? This is important because the thermos for each purpose is different.

Those that were designed for foods, like soup, have a very large mouth so that it is easier to pour into the lid or a bowl. The thermos for tea and coffee (as well as other hot beverages) has a much narrower neck to control the flow of liquid when you go to pour.

You should also look at the material a flask is made from. Plastic is the worst material and should be avoided.

It does not do well when it comes to retaining heat, and it is also very fragile which makes it tricky to carry around.

Metal is the best material, and the most commonly used, namely stainless steel. The inside chamber is sometimes made of glass because it is more hygienic and easier to clean.

You should always check out the reviews for the flask you are looking to purchase. They can tell you a lot about a product and its overall quality, giving you good insight before you buy.

While expensive flasks are often more durable and reliable than the cheaper ones, this is not always the case, and so the reviews can come in very handy. Look at the quality and not the price tag.

Things to Look for

When you go to purchase your thermos flask, there are a few things you should bear in mind. The first of these is the volume.

If you don’t plan on sharing with a group of people, then it is often worth going for the smaller sizes because they are easier to carry around with you and you will be able to get through the serving better. For sharing with large groups, the larger volume models are suggested.

The cap is also very important. Many people forget to check how efficient the cap is when you close it.

Ideally, it will fully close and lock the heat into the thermos flask without any being lost. Ones that are sealed with a cork are not recommended as the seal is insecure and can cause leakages.

Screw caps are the best option because they are incredibly secure and provide a tight seal.

The Advantages of a Flask

Here are a few of the benefits to using a thermos flask on your hikes and treks.

  • Keeps your food and drink hot all day
  • Keeps the liquid contents secure in your bag with no leakages
  • They are durable and safe to use
  • They can even keep your water / drinks cold for up to 24 hours
  • Help you to stay hydrated while you are on the move
  • Ideal for sharing with others in your group

All that’s left is to choose the perfect one for you. Take a look at our thermos flask reviews for some of our favourite models.

Best Thermos Flask Review - Comparison Chart 

Thermocafe Hammertone 1L

 Best Stainless Steel Flask

Thermocafe Hammertone 1L

Another model from Thermocafe, they are leaders in their field, producing some excellent quality products at affordable prices.

This stainless steel flask offers great protection and warmth for your food or beverages, and it might just be the right one for you and your travels.

The Good

This thermos flask has a double wall with vacuum insulation for retaining either hot or cold temperature, as well as a durable stainless steel inside and outside.

This makes it easy to clean and hygienic for the storage of food and drink.

When it has hot liquids inside, it will still be cool to touch, and for cold drinks, it is completely sweat proof. So you won’t need to worry about burning yourself or condensation damaging your items.

 It also comes with an insulated stainless steel serving cup so that you can eat and drink easily. The twist and pour stopper also allows for easy pouring.

It's an excellent design, solid professional-looking and sturdy. I am excited to be reviewing this incredible product. I started by brewing up a 1 Lt of herbal tea at 6 am, went out for the day with the family in November freezing wet weather. I kept checking how hot the herbal tea was throughout the day, and it didn't start to cool until evening, around 13 hours. That's impressive.

The Not So Good

It does not come with any kind of warranty, and some have had issues with it after a year.

Features - 
  • Brand : Thermocafe
  • Material : Stainless steel
  • Capacity : 1 Litre
  • Dimensions: 30cm x 9cm (Height x Diameter)
Our View

This affordable thermos flask is one of the best around when it comes to stainless steel models.

 Keeping your hot drinks hot, and the cold ones at deliciously cool temperature, it can hold anything you need without letting it leak in your bag. It’s a great model that comes from a trusted and reliable brand.


Q: How long does the flask keep the fluid hot/warm?

A: Hot to warm after 9 hours ,expect longer if just hot water inside rather than with milk aswell . 

Thermocafe Stainless Steel 1L Flask

Best Thermos Flask to Keep Coffee Hot 

Thermocafe Stainless Steel 1L Flask

A top brand for thermos flasks, this stainless steel model, was made to keep your coffee hot so you can stay awake and alert on long hikes and early morning starts to your camping trips.

Take a look below and see if this is the right model for you.

The Good

This is a stainless steel, vacuum insulated flask, that is virtually unbreakable.

So you can store it away in your backpack, and it will remain secure and undented throughout the day.

I like that this flask has a twist and pour stopper that is not only secure, but allows you to take full control of pouring the contents. This way you don't need to worry about hot water leaking.

It is able to keep contents hot for an excellent eight hours, or keep your drinks cold for 24 hours. It also comes with a cup so that you can drink easily, and comes from a brand that is eco-conscious about their impact on the environment.

The Not So Good

There have been a couple of issues with the rubber sealing ring being loose at times.

Features - 
  • Brand : Thermocafe
  • Material : Stainless steel
  • Capacity : 1 Litre
  • Dimensions: 30cm x 9cm (Height x Diameter)
Our View

This thermos flask is incredibly priced, especially for the quality of the model. It is sure to keep its drinks hot (or cold) for an extended period of time, so you can enjoy your coffee at just about any point in the day.

With a nifty twist and pour stopper and excellent durability, it’s not one to miss out on.


Q: Does the body of the flask get hot to the touch once full of hot tea?

A: No- not really even warm. The vacuum feature prevents the heat travelling to outter shell. It's a great flask. Looks good and functions beautifully.

Grunwerg Vacuum Insulated Drinkpod Capsule Flask

 Best Small Flask 

Grunwerg Vacuum Flask 0.2L

A good brand, this little flask has a modern design that will make you look twice when you start browsing.

It comes in a range of great colours, so you don’t have to settle for black, and it might just be the perfect flask for you. Take a look and see.

The Good

This vacuum flask works as your own personal hydration system, keeping your liquids stored securely inside while you hike or camp.

It is able to keep hot drinks or liquids (like soup and coffee) drinks hot for hours at a time.

If you have cold liquids, however, it can keep those cool as well for up to 24 hours. It is made from stainless steel and has a double wall for extra insulation.

The Not So Good

While a good model, it does not keep liquid warm for as long as the larger flasks on the market.

Features - 
  • Brand : Grunwerg
  • Material : Stainless steel
  • Capacity : 200ml
  • Dimensions: 17.5 x 7 x 7 cm
Our View

This little flask is affordable, handy, and fits just about anywhere in your rucksack or mesh pockets. So no matter where you are, you can stay hydrated (or caffeinated) throughout the day.

With double wall insulation and a stainless steel construction, it’s sure to serve you well if you need something small and handy.


Q: Does this flask have a drinking cup?

A: No just a screw top. 

Q: Can i put this in the dishwasher?

A: The main section of the flask is metal and I can advise that I have put mine in the dishwasher from time to time however they are very easy and best cleaned in soapy water in the sink by hand.

 ThermoCafé 183344 2010 Steel Travel Mug, 400 ml

Best Travel Flask 

ThermoCafé 183344 2010 Steel Travel Mug, 400 ml

Another model from the leading brand, Thermocafe also have a superb travel model for a drink on the go, making it ideal for picnics and other gatherings.

With a stylish design and excellent price, it’s worth taking a look at this nifty little model.

The Good

It may be small, but with a wide mouth it boasts a great design and fantastic retention of heat despite this.

It has double wall foam insulation to retain either drinks hot or cold temperature, so your coffee and water stay at the optimal levels for hours at a time.

It also has a durable stainless steel exterior that is easy to clean and also has a nifty little handle so that you can drink from the thermos like a mug.

It has a spill resistant slide lock lid to keep the contents secure, and it will also fit most vehicle cup holders for when you are on the road.

The Not So Good

There have been a couple of issues with the locking mechanism on the lid, but these are relatively uncommon.

Features - 
  • Brand : Thermocafe
  • Material : Stainless steel
  • Capacity : 400ml
  • Dimensions: 18.5 x 8.5 x 12 cm
Our View

This thermos flask is available at a low price and has an excellent level of quality. Well insulated so that it can keep hot drinks and cold drinks at the ideal temperatures, it’s perfect with its wide mouth for picnics, car journeys, or even use in the office when you have a long day of work ahead. A great buy at a great price.

 Zodiac 3.0 Litre Stainless Steel Air Pot

Best Large Flask 

Zodiac 3.0 Litre Stainless Steel Air Pot

Zodiac is a great brand with some equally excellent products.

This thermos flask, or air pot, is no different. With a sleek modern design, wide mouth and it looks good and delivers excellence that you would expect from a top brand. Have a look for yourself and see what you think.

The Good

This flask has a three-litre capacity, which is huge, but also sure to fit in most large rucksacks.

It is the perfect container for soup or large amounts of tea or coffee that you wish to share with other members of your group.

It even comes with a drink dispenser that can be used anywhere.

It is made from stainless steel for good retention of heat or cold air (depending on what you have inside), and it is very easy to clean as a result.

It also comes with a useful handle on the top so it can be carried around with ease, which also makes it easier to share the contents with the group.

The Not So Good

Some customers have had issues with the pump mechanism upon receiving the product.

Features - 
  • Brand : Zodiac
  • Material : Stainless steel
  • Capacity : 3 Litre
  • Dimensions: 15 x 6.9 x 17 cm
Our View

This large flask with its wide mouth is ideal for sharing soup or other hot beverages with members of your group. It can even be used to store hot water so everyone can make their own brew accordingly.

It comes at a very reasonable price, and the fact that it also has a drink dispenser is a huge bonus. Definitely one to consider if you are setting out with a large group.

Further Thermos Flask Models

Here are some of the other great thermos flasks that we reckon will keep your food and beverages warm (or cold drinks) and safe in your pack.

Starbucks Travel Mug

Starbucks is a popular coffee brand, and their range of thermos flasks have also seen a large number of people buying them.

It is double walled to keep the heat in and is made from plastic with a flip top lid with a wide mouth to keep it closed.

It works well and does not leak, which is excellent, but it does not keep the liquid hot for as long as a stainless steel model would. Good if you are not planning on leaving the contents all day.

To Conclude

We have taken a look at some fantastic flasks in this guide, all with the aim of finding the best thermos flask or best vacuum flask for you.

Of course, a lot of that depends on what you want personally. From stainless steel to designer models from top brands like Cath Kidson, there is a top flask in each of the section in this guide.

From budget prices to those that go a little higher, we also work hard to try and find something that is in everyone’s price range. Hopefully, one of these models has caught your eye and suited your needs, but if not please let us know.

What did you think of our thermos flask selection? Are there any you would have added? We love hearing from you, so feel free to leave a message in the comments below.