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Rocky Mountain

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The Rocky Mountain Tumbler claims to keep beverages cold for up to twenty four hours, and hot beverages hot for up to twelve hours. It is perfect for a variety of drinks like coffee or tea in addition to cold drinks like water with ice or sodas. That said, you can bring this tumbler with you and use it indoors and outdoors. Made from stainless steel, the top is clear so that users can see what is inside.

Total Cost Breakdown

The cost of Rocky Mountain is $19.99 plus $7.99 shipping. The special TV offer allows you to receive a second Rocky Mountain by paying the extra shipping fee of $7.99 for a total price of $35.97.
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  • Hot or Cold

    It can be used to keep drinks hot or cold all day.

  • Insulation

    This tumbler has a double wall vacuum inside of it which gives extra strength insulation. Compared to plastic tumblers it will keep hot and cold drinks warmer and colder for twice the amount of time.

  • Clear Lid

    The lid attached to the tumbler is clear which lets you view how much of your beverage is still left inside.

  • Bpa Free

    This container is BPA free.

  • 30 Ounces

    It is sized such that it can hold up to 30 ounces of liquid.

Positive Points

  • Double Wall Vacuum

    The double wall vacuum insulation is what the company claims can prevent outside condensation from forming, and also what keeps the temperatures where they ought to be. This design is what allegedly keeps the temperatures cool inside even if the outside temperature rises, and vice versa.

  • Many Users

    Thermal mugs like these are ideally suited for those users who are often on the good, who are regularly outside. Also well suited for those who don’t necessarily have the time or desire to make multiple trips to the office kitchen. Good mugs will perform almost the exact same indoors or outdoors, making them the perfect way to store hot or cold drinks on the go. The flexibility in terms of keeping cold and hot beverages at the desired temperature means this tumbler is well suited for office works. Same as it is for construction workers who are outside, teachers, or sports fans out at an event.

  • Environmentally Friendly

    Using a thermal mug like this helps the environment because it reduces the amount of plastic and polystyrene cups which are used.

  • Variability

    It can hold cold fruit smoothies, soft drinks, or ice water. Alternatively, it can hold hot cocoa, coffee, tea, or even hot soup.

  • Tapered

    The cup design is tapered so that it fits standard cup holders.

Negative Points

  • Might Not Fit Car

    If your car comes with anything other than standard sized cup holders, this tumbler might not fit.

  • One Design

    There is only one design type, no additional colors or styles, nor any additional prints. This means they all look the same and design wise, it is rather limiting.

How It Works

Thermal tumblers like this work by way of insulation. Each contain insulates your drink by placing an additional layer of air in between your beverage and the outside environment. This can be done with insulating materials such as foam or with a vacuum seal. Heat then warms the air which is trapped in between and slows down how quickly your drink cools. Food science behind this is the same as covering yourself with a blanket at night. Blankets put a layer between your body and the outside air, and then traps the warm air generated by your body heat in between you / the blanket. The only real difference here is that thermal mugs have vacuums from cold air, which prevent any outside air from entering.
One key thing here to remember is the surface areas to volume ration. An espresso, for example, will get colder a lot faster than a large cup of coffee. Reason for this is the surface areas to volume ratios. Said espresso is served at the same liquid temperature as the large cup of coffee, but when you get it, it comes in a small glass. As a result, this means more of the total amount of coffee is touching the glass and therefore heat is conducted away. Your size of the mug is often the same size as a big cup of coffee which helps keep the changes in temperature to a minimum.

How it's Different from Competitors

Generally speaking, the myriad tumblers and thermal mugs out there for cold and hot beverages all keep for the same amount of time. For hot drinks, it can be expected to remain hot for between four and six hours. Yet, for cold drinks it can be expected to remain cold for up to twelve hours. Thermal mugs which come with vacuum seal lids are more efficient and keeping the temperature steady for the duration of use. That said, the claims that this tumbler lasts for 24 and 12 hours for cold and hot drinks respectively makes it a better option compared to competitors. However, there exists no real data to substantiate that claim as of yet nor any additional information on what really makes it stand out scientifically. Given that it uses the same vacuum seal and the same steel type as almost all other tumblers on the market, this claim should be taken with a grain of salt.

Save Money

Using a cup like this saves you money because you can bring your favorite hot or cold beverages anywhere you go, without having to stop for a drink along the way. You can make coffee at home in the mornings, always guaranteeing you get the brew you like best, and bring it to work. This will save you a lot of money on coffees or cold beverages from cafés when you are out and about.

Steel Type

Said product is made out of 18 / 8 stainless steel which claims to be indestructible. 18/8 is actually the most commonly used stainless steel for containers like this. This steel composition is called “304” in America. It is considered an austenitic form of stainless steel which means it is very, very weakly attracted by magnets. Other compositions include 18/10 and 18/0.18/10 is used for cutlery while 18/0 is ferritic steel, attracted by magnets, and not often used. Ferritic and austenitic versions of all three of these compositions cannot be hardened by any heat treatment which is what makes them suitable for cutlery. Martensitic versions of stainless steel respond to hardening heat treatments which means they are better suited for knife blades. Highest quality blades are made by combining both types. The same is true of tumblers. That said, high quality steel contains some amount of nickel which gives it higher corrosion resistance.


  • Bpa

    You always want to be on the lookout for BPA. BPA is called bisphenol A and it is a chemical that is often found in the lining of food containers, food cans, or water bottles. There is some scientific evidence that links BPA exposure to certain negative health effects that might interfere with development or behavior. Finding travel mugs which expressly state “BPA Free” on them will do you and your loved ones a world of good. Not all mugs state this, and whether it is made of ceramic, stainless steel, or plastic, it could still have a certain amount of BPA. So do your research.


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Tunbleruser - (Willard, OH)
Posted: 12 Sep 2016
I have a Question

Assuming that this is up to par with other similar products, Wal-Mart brand tumbler Ozar Trails is under $10 each. Why spend $18.50 per tumbler?

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