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Best Vacuum Flask

Do you prefer your drink hot or cold? Depending on the temperature, either is good just not room temperature. While this might seem like space age technology, vacuum flask can keep drink hot or cold for hours on end. Ice doesn’t melt as fast and hot coffee stay hot. This technology works by trapping and repelling thermal energy. The Best Vacuum Flask has tight seals with copper lining that repels thermal radiation.

How Does a Vacuum Flask Work?

Between most vacuum flask, there is a void of air. Because there is no medium, thermal energy cannot travel in or out. As a result, the temperature stays mostly consistent.

However, most vacuum seals are not perfect. Thermal Energy usually escapes via the gasket. While it does a pretty good job sealing, it can still seep through. Opening it also causes a quick lost of thermal energy.

Glass vs Stainless Steel

Older Vacuum Flask uses glass lining for their interior. In terms of performance, there isnt much difference. However, for durability, stainless steel wins hands down. If you can, I recommend that you stick with the newer model. Not only that, the gasket is probably in better condition. Finding replacement can be difficult.

Thermos Flask vs Vacuum Flask

Both are the same, just under a different name. The difference is probably due to the popular of the Brand Thermos. While their method of doing it might be different, the principal is most the same. Their product work by limiting the travel of thermal energy.

Best Brand of Vacuum Flask List

Below, you will find some of the best brand of Vacuum Flask. All make good product but performance may differ, choose one that best suits you.

Zojirushi SM-SA36-BA Stainless Steel Vacuum Insulated Mug, 20-Ounce (Best Overall)

Zojirushi is best known for their rice cooker. However, they actually got their start making vacuum seal jar. In my experience, they are the best performing out of the different brands. It keeps drink hot longer and ice drink cold longer. However, the downside to this brand is the size and the gasket. The performance is mostly due to the amount of gasket use. The problem with this is the amount of cleaning you have to do. If left untouch, it can develop mold.

Stanley Classic Vacuum Insulated Wide Mouth Bottle (Best Mid Size Thermos)

Stanley is one of America oldest thermos manufacturer. In recent years, their thermos started production in China. The formula for their product also changed a bit. While I think that its a downgrade, it still performs better than most brand. Plus, the amount of gasket used is much less than Zojirushi. This makes cleaning easier and less of a headache. Its also quite a bit cheaper than Zojirushi. As a result, this is the best option for large size Vacuum Flask.

Zojirushi Stainless Steel Vacuum Air Pot Beverage Dispenser, 1-Gallon / 3.8-Liter (Best Large Size Vacuum Flask)

If you plan on making hot or cold drinks for a large party, than this gallon size vacuum jug is the way to go. Its easy to dispense, all you need to pump. Plus it holds drink at a steady temperature for 6 hours plus. However, it is a bit pricey.


Vacuum Flask are a great way to store drinks. It uses less energy and it keeps drink hot or cold. For the best personal thermos, go for Zojirushi. It has the best performance out of the different brand I tried. For a mid size one, I like to use stanley. However, for the large family size model, Zojirushi takes the cake. They all fit different purpose, get one that best suits your need.

Want more information on our winner? Check out our Zojirushi Thermos Review.

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