How To Select A Good Thermal Flask

How To Select A Good Thermal Flask

The things you look for when buying a flask will obviously depend on what kind of flask you are looking for. This guide will cover for thermal flasks/thermal food jar (for coffee, tea, soups and cold drinks). We are going to cover them so that you do not get confuse when buying yourself a stainless steel thermal flask or a stainless steel thermal food jar.


Things To Look For When Buying A Stainless Steel Thermal Flask/Thermal Food Jar:

Thermal Flasks or Thermal Food Jar are a great choice for you if you want to bring your own hot drinks or hot foods with you. Thermal flasks can prove very handy and cost-effective if you use them to take your own coffee/hot drinks to work with you. This able to prevent you to end up spending twice as much on expensive coffee shops. Thermal food jar is the most suitable for you if you wish to use them to take hot food such as soup so that you are able to get a taste of home no matter where you are!

There are quite a few different types of thermal flask/thermal food jar which have been designed for different purposes. Before you buy a thermal flask/thermal food jar, you need to ask yourself what exactly you are likely to use it for. Do you want to use it for food or hot drinks? Would you like to use it for cold drinks?



There is a huge range of thermal flasks/thermal food jar to choose from and they can range from the cheapest to the surprisingly expensive. You might assume that the higher the cost for thermal flask/thermal food jar, the higher quality. But this is not always the case and some cheaper flasks may well function as well or better than a higher-range. It is important to check customer reviews so that you are able to get a good idea of how well the thermal flask in question actually works in real life.


Thermal Food Jar:

If you are buying a thermal food jar primarily for soup and other liquid-based foods then there are a few things you will want to look out for:

  • Capacity - The capacity is very important because it will determine how much food you are able to fit into the jar. Food jar sizes can range from around 300ml for smaller meals to around 700ml for larger quantities. The size and capacity of the food jar that you choose will depend on how much food you want to bring with you, whether you are using the food jar for hiking or long-distance journeys where you may want to carry more than one meal with you, and whether you are planning on sharing it with someone else.

  • Lid - You may also want to look for thermal food jar which come with a lid that can also be used as a serving bowl so you can eat whenever and wherever you want, and some food jar come with a foldable spoon.

  • Material - Thermal flasks can be made out of various materials and some of those materials are a lot better than others. Plastic is a cheap material which will definitely cut the cost of your flask, but it is not thermos-stainless-steel-curved-food-flask recommended because it does not retain heat well, it is fragile and it is likely to break. Metal flasks, mostly stainless steel is more highly recommended because they are durable, easy to clean and better at retaining heat. It is a good idea to check the reviews of a few different flasks to make sure that they are up to scratch as you cannot tell how good a flask is going to be just by looking at it and reading it’s product description.

  • Heat Retention - The heat retention is another important factor as the amount of time that a food jar can keep your food hot or cold varies from around 4-5 hours to as long as 12-15 hours. You also need to check how long the flask can keep your food cold.  The food jar will normally be able to keep food cool longer than it can keep it hot, but some flasks may not be tailored for cold food at all.

  • Warranty - The warranty is another important factor to consider. Some thermal flasks/thermal food jar offer longer warranties which may cover you for a decade or even longer whilst others will not offer a warranty at all. If you are planning on spending quite a lot of money on your flask you will want to make sure you are covered in the event of any problems.


Thermal Flask:

This type of flask is essential for coffee fiends everywhere. Stainless steel thermal flask are one of the great choice if you want to take your morning coffee to work with you, if you want to save on chain store coffee without having to resort to the instant office brew, or if you are planning a long trip or hike and you want to keep warm and alert throughout the day.

The amount of time the flask can keep your drink hot/warm is very important. Some thermal flasks can keep your drink warm for up to 24 hours, whereas others will only last for around 6 hours or less. If you are going on a journey and you want steaming hot coffee all day then you will want the flask to keep your drink warm for as long as possible, but if you only need to keep your drink warm for a few hours then this won’t be as important. Remember to check customer reviews as sometimes the product will boast that it can keep the drinks warmer for longer than they actually can in reality.

  • The Lid - Your thermal flask’s lid needs to be secure and effective. It should not easily come off, it must not leak, and finally, it should be easy to clean.  The lid should loosen and tighten easily and it should fit the flask flawlessly. Some thermal flask come with corks to keep them closed, but these are often not that effective as these might end up with leaking problem. Screw caps are a better option because they are more likely to keep in place, but it is still important to check reviews if you are buying online as this is to ensure that the cap does accurately fit the flask.

    Many of these lids can also double as a cup which really comes in handy if you are outdoors and you do not want to carry an extra cup around with you. The thermal cup should be made out of the same material as the flask and it should be able to retain heat in much the same way. This will allow you to enjoy your drink at the temperature you want without it cooling down too quickly.
  • Material - The material that your thermal flask is made out of can have a huge effect on the flasks durability and how long it lasts. Stainless steel is a common and popular option as it is a durable, resistant and easy to clean material which can retain heat pretty well. Plastic and glass thermal flasks should be avoided as much as possible because they are more likely to break, they are not great at retaining heat and they may rust fairly easily.

    You will also want to check how well insulated your thermal flask is. If the flask is double layered then it will stop the heat from escaping your drink, and if it is vacuum sealed then it will retain the heat even more efficiently. It may be better to get a vacuum sealed thermal flask which is made out of the inferior material than a stainless steel thermos which is not well insulated as the former is likely to keep your drink warmer for longer.
  • Other Features - When you are looking for a thermal flask, you may want to check and see if the flask has carried handles as this will make it easier to hold and carry around. Free carry bags which can help prevent any leaks messing up the contents of your bag. You may also want to choose a flask which comes with a money back guarantee or warranty. If you are buying your flask online, it is pretty hard to tell how well the flask is going to hold up even if you read all of the customer reviews. The warranty is there to protect you because, if you are unable to test the flask beforehand, you can send it back for a refund/exchange if it does not function as advertised.


At Relax®, each of our bottles & thermal flasks represents:

  • Our promise to inspire a happier community through positive and educational messages embedded in our products.
  • Our commitment in continuous improvement towards better quality & safety.
  • Our dedication in product innovation.
  • Our pursue of aesthetic designs.

We believe in Real Quality, Reasonable Price.


Leave a comment

Your email address will not be published. Required fields are marked *

Please note, comments must be approved before they are published