Top 5 Best Thermo Flasks in India | Buying Guide & Product Reviews [Updated 2022]

Thermo flasks are also called vacuum flasks. It has an insulated coating inside that keeps the cold liquids and hot liquids at the same temperature for at least 24 hours. Best Thermo flasks in India are a reliable source for a busy person who can’t keep up with the regular timings of their family members. Naturally, everyone has their schedules and tasks to do. Having a thermo flask is like carrying a taste of home wherever you go.

We have listed some of the best thermo flasks in India for you to manage your drinks and carry them wherever you go. It is convenient to carry to picnics, trekking, gyms, and the workplace as well.

The article will guide and will save a lot of time from researching and reading reviews. 

Milton Duo DLX 1000 Thermosteel Thermo flask
Milton Duo DLX 1000 Thermosteel Thermo flask
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Milton Thermosteel Thermo flasks
Milton Thermosteel Thermo flasks
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Cello Flip Style Stainless Steel Double Walled Flask
Cello Flip Style Stainless Steel Double Walled Flask
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Buying Guide


The material is an important factor while buying a thermos flask. It has a major effect on the durability of the flasks. The common material type for the Thermo flasks is stainless steel. It is resistant, durable and super easy to clean. It is a type of material that retains the temperature well. Glass and plastic thermals break easily and are not great temperature resistants. 

There is another type which is an insulated thermal flask. These flasks are double-layered, which keeps the temperature the same. It has the capacity to resist the temperature for 24 hours.


The Thermo flasks have a leak-proof body that makes it easy to carry any beverage wherever you go. You don’t have to worry if you choose the insulated thermal flask because they are 100% leakproof.


One should select a Thermo flask that is easy to clean. No one wants to struggle to clean a flask, so better choose the flask wisely before buying it. They are super easy to clean. They can be cleaned using a detergent or baking soda. The interiors of the flask require to be cleaned regularly to avoid the accumulation of residues.

Temperature retention

The main factor for considering before buying a thermal flask is the capacity of the flask to retain the temperature of the beverage. It is perfect for storing cold or hot beverages and carrying them along to the workplace or any place you go. One can even store water to sterilize the bottles of babies.


The bottles need to have a grip and fit in hand perfectly. Few thermos flasks come with ergonomic grip. They can be carried easily by school-going children as well. The grip is an important point to be mindful of. 


The lid of the thermal flask must be secured tightly. It is the only way that the heat gets out from the container. It should not come off easily and should not leak. They should be perfect for the flask. It should be easy to tighten. Few thermal flasks come with cork lids, but they are not that effective and end up leaking. The screw-type lids are considerable because they fasten to the neck of the flask perfectly. 

The other type of lid is the double lid that can be used as a cup. The double lid is also a screw-type lid. The advantage is that the lid can be used for purposes like a cup or mug. It would be handy in picnics or trekking. But the lids of the thermal flasks should be of the material of the flask because they even have to keep up with the temperature.


The size of the thermal flasks depends upon the quantity it is supposed to hold. Larger the quantity, the larger the flask is, and vice versa.

Price range

The thermal flasks are pocket friendly. But if you find them costly, they are worth the price. The price of the flasks range from 800/- to 2000/-. 


Every thermal flask comes with a warranty of at least one year. The warranty can protect you if you can not handle the flask or if it’s damaged.

Top 5 Best Thermos Flask In India 

best flask for hot water

1.Milton Thermosteel Thermo flasks Best premium pick thermos flask

Milton aims to provide high-quality products and works on innovation of best products
Rs.886Rs.1,095 Buy this item
best thermos flask for keeping drinks hot

2.Milton Thermosteel Duo Deluxe Best overall thermos flask

Milton is one of the largest producers of homeware products
Rs.1,054Rs.1,320 Buy this item
best thermos for hot drinks

3.Cello Stainless Steel Flask Best budget buy thermo flask

Cello is one of the leading processor of common household consumer products
Rs.799Rs.906 Buy this item
best thermosteel bottle

4.Borosil Stainless Steel Flask Water Bottle Best stylish thermos flask

Borosil is leading consumer glassware company in India
Rs.790Rs.875 Buy this item
the best thermos flask

5. Solimo stainless steel flask Best personal use thermo flask

Solimo manufactures high quality kitchen storage products
Rs.899Rs.1000 Buy this item

Milton Thermosteel Thermo flasks

Milton Thermosteel

Rs.886 Rs. 1,095
Best premium pick thermos flask
Is it still a thing to use flip lid bottles? Yes, it has its way of giving a chill. This is the best Thermo steel bottle in India which is perfect for sports and trekking. It is easy to carry, and it’s not heavy. The perfect choice if you are into sports or tasks relating to that. 
  • Leakproof
  • Temperature retention
  • One year warranty
  • Easy to clean
  • Strong and durable
  • Cannot store carbonated drinks

Special Features:

  • Temperature retention
  • High-grade stainless steel
  • Flip lid
  • Anti-corrosive
  • Resists leakage

Product Specifications:

  • Capacity: 1 litre
  • Material: Stainless steel
  • Weight: 530 g
  • Dimensions: 8.6 x 8.6 x 31 cm
  • Lid Style: Flip lid
  • Price range: 750/- to 1000/- 

Detailed Review:

The Thermo steel flip lid flask has a stainless steel body with copper insulation to retain the temperature. Stainless steel is high-grade steel that is anti-corrosive.

The temperature remains the same for a maximum of 24 hours. It keeps the beverage at the same temperature when poured into the flask. It is strong and durable, and amazing for storage.

It comes with a leak proof lid that prevents the beverages from leaking. The lid of this thermo steel flask is a flip-type which makes drinking effortless. It comes with a carry pouch which makes it easy to carry. The flask is super easy to clean and also comes with a warranty of 1 year.


Milton Thermosteel Duo Deluxe

Milton Thermosteel

Rs.1,059 Rs.1,320
Best overall thermos flask
The next best product on the list is the Milton thermosteel duo deluxe stainless steel flask. It can maintain the same temperature. It is the best flask for hot water in India. It keeps the cold beverages cold up to 24 hours and hot beverages hot up to 18 hours like it is the best flask for hot milk and other beverages. 
  • Copper inner coating
  • Rust free
  • One year warranty
  • Durable and strong
  • Stain and odour free
  • Heavy

Special Features:

  • 304-grade stainless steel
  • Copper inner coating
  • Prevents contamination and infestation 
  • Temperature retainment
  • Anti-corrosive 

Product Specifications:

  • Capacity: 1 litre
  • Material: stainless steel
  • Weight: 400 grams
  • Dimensions: 17 x 8 x 17 cm
  • Lid style: twist open
  • Price range: 1000/- to 1500/-

Detailed Review:

The thermos flask is made of stainless steel, which is anti-corrosive. It is stain free and odour free. The product comes with a one year warranty. It is super strong and durable. The lid style is twist open which makes it easy to use.

The stainless steel grade is 304, which is high and perfect for usage. It comes with a copper inner coating that retains the temperature for 24 hours. It is leakproof, so it can be carried wherever you go without any worries.

It prevents the beverages from contamination, and the inner copper coating is good for health. Copper has its health benefits. It is the best use for the gym, sports, school and outdoors.


Cello Stainless Steel Flask

Cello Stainless Steel

Rs.799 Rs.906
Best budget buy thermo flask
The cello stainless steel flip-style flask is one of the best tea flasks in India. It has steel technology with a double-walled vacuum that keeps the beverages with the same temperature and taste. The stainless steel flask retains the temperature for hours together.
  • Fine quality stainless steel
  • Durable and strong
  • Multi-purpose cap
  • Rust resistant
  • Strap to carry
  • Leakage problem
  • Low-temperature retention

Special Features:

  • Double-walled vacuum flask
  • BPA free
  • Food grade stainless steel
  • Removable clip on mouth
  • Vacusteel technology

Product Specifications:

  • Capacity: 1 litre
  • Material: stainless steel
  • Weight: 700 grams
  • Dimensions: 9.5 x 33 x 95 cm
  • Lid type: twist open
  • Price range: 500/- to 1000/-

Detailed Review:

Cello is one of the reliable brands when it comes to products regarding lifestyle. A product like that is the cello stainless steel flask. The flask is made of thermo seal technology, which 100% prevents leakage. 

It is a double-walled vacuum flask that helps in retaining the temperature for at least 24 hours. It is made of good quality steel, so it makes the flask durable and strong. The material used is BPA.

It is portable, and the lid can be used for various other purposes. The lid can turn into a cup which is perfect for picnics or road trips. The mouth of the flask has a removable clip. It is a travel-friendly thermos steel flask.


Borosil Stainless Steel Flask Water Bottle

Borosil Stainless Steel Flask

Rs.790 Rs.875
Best stylish thermos flask
It is an excellent product with a compact design and stylish look. A perfect product for college or sports use. It retains the temperature for at least 20 to 24 hours. You do not have to worry about leaching and chemical contamination. It is just a perfect stainless steel thermos flask.
  • Stylish design
  • Anti-slip
  • Temperature retention
  • Easy to carry 
  • Semi-matte finish
  • Not leakproof
  • Can be cleaned using mild detergents

Special Features:

  • Condensation free exterior
  • Slip-free holding
  • Cutting edge technology
  • Temperature retention
  • Non-leaching toxin-free 

Product Specifications:

  • Capacity: 700 ml
  • Material: Stainless steel
  • Weight: 400 grams
  • Dimensions: 7.6 x 7.6 x 25 cm 
  • Colour: black
  • Price range: 700/- to 900/-

Detailed Review:

The borosil thermos steel flask is condensation-free, which means it does not form vapour from the outside when a hot or cold beverage is poured in. It comes with a slip freeholder that makes it comfortable to handle. The special feature is that the flask is anti-slip. 

The product has cutting edge technology and a semi-matte finish giving it a stylish look. It is BPA free and ensures the beverage is chemical and toxin-free. It has stylish design and is the best bottle in this price range. 

The lid is twisted open, and the flask’s mouth is wide, which makes it easier to drink and put things like ice cubes and tea bags easily. It is rustproof and retains the temperature for a long time.


Solimo stainless steel flask

Solimo stainless steel

Rs.899 Rs. 1000
Best personal use thermo flask
The Amazon stainless steel thermos flask has an additional pouch that makes it easy to carry wherever you go. It is strong, durable, and made of double-walled stainless steel. The lid can be used multi-purpose. It is perfect for outdoor adventures and the best tea flask in India.
  • Anti-drip push open lid
  • Multi-purpose lid
  • Durable strong
  • Rust resistant
  • Easy to clean
  • Can’t carry without case
  • Substandard cover

Special Features:

  • Double-walled stainless steel
  • Snug-fitting lid
  • Spun matte finish
  • Rust resistant 
  • Carrying pouch

Product Specifications:

  • Capacity: 2 litres
  • Material: stainless steel
  • Weight: 500 grams
  • Dimensions: 37.4 x 10.4 x 9.6 cm
  • Colour: black
  • Price range: 800/- to 1000/-

Detailed Review:

The product is made up of an insulated stainless steel body that helps in retaining the temperature. The flask is made of double walled stainless steel so it can hold the same temperature for up to 24 hours.

It comes with an anti-drip push open that prevents leakage, so it can be carried to wherever you go without any worries. The product has a warranty of 1 year. It is strong and durable. The lid has a  spun matte finish which gives a stylish look.

The bottle has three different models with their advantages. But this particular product has a twist cap that doubles as a cup, and it comes with a pouch that makes it easy to carry. It is super easy to clean.

How have I ranked the products in the list of best thermos flasks in India?

The products mentioned in the article were listed based on the material, mindful of leakage, cleaning, temperature retention, grip, lid, size, price range and warranty. They were picked from some top brands and made all the features accessible to you at a pocket-friendly price. The flasks or bottles should not be a burden for you to carry so keeping that in mind we have listed the best designs which are used for multi purposes, easy to carry around and give homely vibes. 

Care and Maintenance Tips

Thermal flasks have become a major part of most of our lives. The increase in plastic pollution is alarming, and there is an urgent need to give up on plastic and shift to environmentally friendly alternatives. The thermal flasks have their advantages but also need to be maintained at their best. They do need proper cleaning.

  • Clean the thermal flasks using lukewarm water.
  • You must wash the lid too before filling it with beverages.
  • For the thermal flask to be effective, you can pre-fill hot water before 5 minutes for hot beverages, and the same goes with cold beverages.
  • You should not use the microwave to preheat the flask.
  • The thermal flasks should not be overfilled, just in case to prevent leakage.
  •  The flask should be washed thoroughly if not used for a long time or even after using it after a long day.
  • You should not use chlorine or bleach to wash the thermos flasks, and it can damage the inner and outer coating.
  • Please consider a flask with proper grip or a pouch to hold because it fell from a basic height. There is a possibility of a dent in the flask.
  • The tips for cleaning the thermal flasks for keeping them away from odour and germ-free are: using a teabag. It is one of the easiest ways to clean the bottles. All one has to do is pour some boiling water into the flask and put a teabag in it. The bottle should be left overnight, and the bottle will be cleaned thoroughly in the morning.
  • Using baking soda is also another way of easiest cleaning of thermal flasks. All you have to do is add vinegar and warm water to some baking soda and rinse it thoroughly after letting it stay for 5 to 6 minutes. It gives the bottle a new look and removes all the residue from every corner of the flask. It is ideal for keeping away from odours too.
  • Vinegar is another way of cleaning the flasks. Vinegar surely helps with stains or any other stubborn residue with ease. The vinegar can be combined with warm water or chilled water, pour it into the flask, and shake well for 5 to 10 minutes. Later scrub the bottle on all sides using a brush and rinse it. They are different types of brushes for cleaning bottles or long containers. 

So cleaning and correctly maintaining the flasks will help increase the durability of the flasks and make them healthy and germ-free.


1. How can the effectiveness of the thermal flask be improved?

To improve the effectiveness of your thermos flask, you have to preheat the flask before pouring in the actual beverage. You can pour hot water into the flask for 5 minutes for hot beverages, and the same goes for cold beverages.

2. What drinks should I not pour into my thermal flasks?

Any dairy products should be avoided storing in thermos flasks. As milk ferments, it puts a lot of pressure which is not good for health. Dry ice should also not be stored in thermo flasks because they emit carbon dioxide and build high pressure, which is very risky.

3. Which is the best flask for hot water?

Borosil stainless steel flask is the best for storing hot water. It has double-wall insulation that keeps the water warm for 24 hours straight. It is perfect for trekking or someone struggling with chronic diseases. It is a friendly alternative to plastic bottles.

4. Which is the best thermo flask for school?

Milton Thermo duo deluxe flask is the perfect thermal flask for school-going children. It is not too heavy for them to complain about it, and it is way too healthy because it has a copper coating on the inside. Copper is good for health and stores the minerals in the water as it is.

5. How can I remove bad odour from the flask?

You can use a detergent or baking soda to get rid of bad odour from the flask. Or use the Indian technique to use tamarind and scrub the bottle thoroughly to get rid of the bad odour. But you have to make sure to put the beverage only after the flask is dried up and free from detergent or baking soda.

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