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Thermos buying guide

Want to enjoy your drinks after long hikes at the desired temperature? Don't worry. Opt for a suitable thermos to enjoy your drinks anytime you want.

While picking the best one, you have to look into certain aspects. Researching them can take a lot of your time.

So, to avoid the tiresome task, you can look for a compressive buying guide. It will provide you with all the information regarding the product and help you select the best ones.

So, without any further ado, let us dive deep into this guide.

What is Thermos, and why should you buy them?

If you are a tea or coffee lover, then a thermos flask becomes a much-needed product for you. The thermos flask, also known as a vacuum flask, helps keep the liquids warm for an extended period for liquids like coffee, water, tea, and any other substance.

It can be carried with you anywhere you go so that whenever you are in a mood for a warm drink, you can enjoy hot sips of your favorite drink anytime. There are so many advantages of using the flask as they are not too expensive and are readily available in the market.

There are so many brands that offer a wide variety of thermos flask at various ranges. In general, it is an apparatus constructed to keep the liquids warm for a more extended period. Both the inner and outer surfaces of the bottle are efficiently polished.

The heat conduction is prevented with the help of a glass bottle that is double-walled. Conduction of heat is not possible in the thermos flask as the space between the glass of the bottles is completely evacuated. For ensuring the safety of the apparatus, the whole apparatus is enclosed in a metal case and a pad at the neck and cork on the bottom.

Thermos flasks are also available with a strap so that you can easily carry them with you while you are running without any inconvenience. They are an excellent choice if you want to take your homemade coffee or tea with you.

Basically, two types of flasks are used. The first is the thermos flask for hot liquids, and the second is the vintage flask for alcohol. You have the advantage of taking homemade food along with you.

Types of Thermos

There are two different types of flasks available, first is the thermos flask in which you can take tea, coffee, or any hot liquid. The other one is a vintage hip flask that is meant for alcohol. We can discuss both of them in detail, and you can select the flask as per your need and requirement.

  1. Thermal flasks

They are specifically designed to keep your drinks warm for a more extended period. So this provides you with the advantage of traveling along with your homemade beverages. Thermal flasks can also keep hot drinks hot and cold beverages cold, but there are unique flasks available for hot and cold beverages.

  1. Vintage flasks

The vintage flasks are used to carry alcohol. There were some famous and trending hip flasks in the past era, and they are still used by people who like to keep the vintage culture alive. But these flasks are not used for accessories.

They have a practical purpose of keeping the drinks at their moderate temperature and keeping their aesthetic value alive.

  1. Thermal flasks for warm drinks

As we know, Thermal flasks are constructed to keep your drinks at a moderate temperature for a more extended period. They are fantastic for carrying along with you while running or hiking so that you can enjoy your homemade drinks anytime, anywhere.

They are available at cheaper rates and cut out on the expensive rates of the coffee available at stores. Also, the warm drinks can keep you cozy on the cold winter days.

  1. Silver flasks

These beautifully designed flasks are for a rare collection and are a bit expensive. Some people believe that if liquor is kept in silver flasks, it will make it taste good. It is suggested to learn a bit more about the history of flask material that you will buy as one can't tell if you are purchasing a vintage silver flask or a fake one.

Things to deem about while selecting appropriate Thermos


The material used in the construction of the thermos ensures the flask's durability and function. The inside chamber of the flask is often made out of glass.

The glass chamber is considered to be more hygienic, and it is effortless to clean the glass as it also keeps the liquid in a well-preserved manner. The only drawback of the glass chamber is that it is fragile.

So the durability can only be compromised in terms of fragility. One clumsy move can break your beautiful favorite thermos flask. Various materials can be used to make the thermos flask durable.

Plastic can make the bottle price cheap as it is an inexpensive material, but that has a disadvantage as it is known not to retain heat and is quite fragile.

  1. Metal flask

As compared to the glass chamber, the metal chamber seems to be a perfect alternative as it is not fragile like glass. Stainless steel is used by the manufacturers in the thermos flasks to avoid corrosion in the flask.

They are known to retain the heat and are more challenging than the plastic and glass flask.

  1. Plastic bottle

Though it is not the best option, it can still be considered. The plastic is a low material to retain heat, but a special coating is applied to improve that. But it is also very fragile.

The outer case of the thermos flask is also made out of different materials such as plastic, which is responsible for reducing the weight of the bottle, and it makes it easier for us to carry that around.

Solid construction and durability are provided by the metals which are corrosion free. Glass is also used mostly, but that has the disadvantage of being fragile.

It is suggested that you check the reviews of various types of flask material before buying the appropriate one as the quality will matter. One can't guarantee the quality of the material used.

If the flask is double-layered, it will not let the heat escape from the flask quickly and thus keep your drink warm. It is better to buy a thermos, which is vacuum-sealed to keep the drink warm.


It is highly useful to check the volume capacity of the thermos flask you are considering to buy as it is not a bad idea to carry an extra glass of coffee with you. If you are a person who travels a lot or travels with the company, you will need some large volume thermos to adhere to your needs.

The flask volume can range around 300 ml for smaller drinks to as much as 700 ml for carrying larger quantities. The volume capacity will depend on how much volume of the drink you want to carry along with you.


The cap holds the critical value of keeping the heat stored inside and not allowing it to escape. The option of thermos flask glass lids with corks is not considered advantageous as they do not seal correctly and might lead to leakage.

It is recommended for you to look for a flask that has a screw cap. Although there are bottles that can be fitted with valves, the valve does not provide you with proper adjustment, ultimately failing to retain the heat. Also, if you are buying a bottle containing a valve, it will require a lot of cleaning, which can get easily dirty and quite challenging to wash.


While purchasing the perfect thermos bottle, you should keep in mind to buy the flask, which has a lid that perfectly fits and has a secure locking system. This helps avoid leakage in the bottle, which helps you carry the bottle anywhere along with you for trekking or any long-distance trips. Wastage of water is also avoided with the help of leakproof bottles.

The lid should not be lost, and it should not easily come off. They need to be tight to avoid leakage and retain the heat and the quality of the insulation.

Easy to clean

The thermal flask bottle should be easy to clean, and the bottle's interior should be with a superior clean finishing that will prevent any odor or stain. It would help if you considered buying a bottle with a large adjustable opening or full mouth for easy cleaning.

You clean the bottle easily with dishwashing detergent and by using a soft bristle brush. It will ensure proper maintenance and keep the bottle hygienic for use. The bottle should be thoroughly cleaned to ensure that you are drinking clean and healthy water that is good for your health.

Lid Type

You should purchase a bottle with a narrow opening, flip open lid, or a vast space with a cup-like cover. If you want to avoid spilling any water, you should go with the narrow and flip-open cover as it assists you drink the water from the bottle directly.

However, the bottle with a wide opening allows you to pour the drink through the bottle's cup-like cover. This cup is multi-functional as it can be used as a mug to drink your coffee or tea conveniently.

You also consider buying food flasks that are available in the market with lids and can also be used as bowls to serve water or beverages. With these lids, you eat or drink whenever and wherever you want. There is also a range of flask which is available with a foldable spoon.

Design and construction

The thermos bottle needs to be spill-proof, and it is essential for the bottle to have a carabiner loop lock, which will make it perfect to carry around while hiking or trekking. The bottle needs to have a design that is durable and yet attractive at the same time, along with being stylish and strong.

The thermos flask should be long-lasting, and it needs to be light in weight so that you can carry it easily with you wherever you go. The engraved designs can add their bit to add some more brilliance to the creation of the flask.

These flasks are brightly colored and feature beautiful and unique artworks that can define the personality of the buyer and make the flasks look cool and attractive. Tourist flasks, sports flasks, etc. variety are also available, which give a hippy or alternative look to the flask.


The warranty of the flask is an essential factor that is to be considered while you are buying the flask as it will make sure that the product is reliable and secure. There are individual thermal flasks that offer long term warranties that can cover more than ten years or more, but there are flasks which do not even give a guarantee at all.

It would help if you chose the thermal flask that offers the best warranty. If you are considering investing a reasonable sum of money on the flask that you are willing to purchase, make sure it provides it covers the entire problematic event. As you don't want that the fragile flask breaks and you are not even secured by any warranty from the brand.

Heat Retention

Your thermal flask should have double-wall vacuum insulation so as to avoid the conduction of heat that can make your liquids lose their moderate temperature. Your bottle should also be inclusive of the feature of the reflective coating of stainless steel, as that will prevent the heat from evading outwards.

Such features in your thermal flask will assist in retaining the heat for a longer duration so as to keep your liquids hot or cold for an extended period. Your flask can keep your drink hot or cold for a time ranging from 5 hours to 12 hours.

If you are taking a flask for longer routes or a flask with a large capacity, then you will require a flask which will keep your food warm for a long duration so as to provide you with warm fresh food whenever or wherever you want.

If you require your food to stay cold for a more extended period, you can check the description and find out how long it will be able to keep the food cold. These flasks can keep your food cold for a longer duration as compared to the time it can keep your food warm.


The price of your thermal flask will depend entirely on the quality of the flask. The manufacturer of the brand will provide the best quality materials, but generally speaking, the expensive flasks do not always guarantee the efficient performance of the flask.

The price of the thermal flask depends highly on the materials that were used in making the flask. Features and volume also add on to the high cost of the flask. You can get supreme quality bottles from pricing beginning from $24-26.

The price range at which the thermal flasks are available can start from cheap and end at costly rates. Customer reviews can always help you while you are thinking of purchasing a good quality thermos flask and in knowing how well will the thermal flask work for you in real life. It is always an excellent option to check the reviews before making a purchase.


These thermal flasks are often available with a cap that can later be used as a cup or even a bowl to pour your drink in that. This assists you in enjoying your drink or soup anywhere and whenever you want.

There are also flasks that are available in the market which come with a foldable spoon, which makes it easy and convenient for you to carry all things in once to enjoy your hot and sour soup anytime and anywhere you want on a cozy winter day.

While you are camping or you are on a trek or hike, these features will prove to be of great use as they save both your time and space, which will not burden you that much while you are walking to carry all these extra items with you. The thermal flask will allow you to take a break for refreshments wherever you want.


Thermal flasks are designed for drinking your liquids anywhere and anytime you want, so there is also a wide range of shapes and sizes to choose from. The specially designed hip flasks are made to fit around your hip.

There are flasks that are available in the market that are designed for top pockets or the regular ones. There are flasks that are designed to be compact in order to fit inside a purse or smaller bags.

The capacity of such specially designed flasks can range between 6 ounces to 3 ounces or less than that. You can choose the flask of your desired choice depending on your requirements and the quantity of liquid that you want to carry along with you.

There is a special range of novelty flasks that are available in a large variety of sizes and shapes. These flasks are often not considered to be practically used, but they can count in for excellent presents.

  1. Pocket flask

This flask is designed to be compact and fit in someone's pocket easily. They are quite similar to hip flasks, but the body is comparatively flatter, and their corners are round. These flasks are of the same size and have a capacity of 4-6 ounces.

  1. Round flasks

Such flasks have a round shape other than the square or rectangular shapes of regular flasks. They are available in a variety of designs and also in perfume bottle style looks.

  1. Novelty shapes

These novelty flasks are sold as ornaments and are not recommended for practical use. So you need to check whether you can drink from such a flask.

  1. Top pocket flask

These flasks are comparatively smaller from the hip or the pocket flasks. They are specifically made to fit in a jacket's top pocket. They have a small capacity of 3 ounces.

Insulation and durability

An appropriate thermos has excellent insulation. If you require a thermos that will last for an extended period, you need to look for a thermal flask that has vacuum insulation.

It would help if you also were sure that you choose a vacuum insulated thermos, which can retain heat for at least 5 hours for the hot liquids but anyway, more than 5 hours of heat retention will be the best.

Durability is also an important feature to be looked at while choosing the perfect thermal flask. To have long-lasting durability, you need to make sure that the material used in the construction of the thermal flask by the manufacturers is strong enough to hold the vacuum together.

It would be best if you always went for thermal flasks that have enough sturdiness to withstand any bumps or accidents, and the most crucial factor is to resist rust.

If the material used in the making of the thermal flask is metal, you need to be sure that it is stainless steel metal as any other material except that will rust after some use.

The thermal flask also needs to be leak proof because if the cap or the valve of the opening of the flask is loose or does not fit right, it will lead to heat loss, which will negatively affect the heat retention capacity and will make the flask of no use.


  1. Can I clean my thermos with regular detergent?

Yes, they are very easy to clean, and you can clean them like everyday mugs and glasses.

  1. How long can the thermos keep my drink at the desired temperature?

This depends on the type and model you choose. Typically the thermos can maintain the desired temperature for 6-24 hrs.

Final Verdict

Thermos presents a simple and effective way to enjoy your drinks anywhere, anytime. Here in this guide, you will find all the pointers that are necessary to pin down the best one.

Go through the guide and purchase an elite model. / - © Copyright 2020