Iron Flask: 16 Most Commonly Asked Questions Answered

If you regularly use reusable water bottles, you’ve probably heard of the brand Iron Flask. It’s been around for years and has become quite popular. However, many people still have questions about it, and with good cause.

After all, it’s never a good idea to buy a product that you don’t understand. So to make things easier for you, we have decided to answer the most commonly asked Iron Flask questions in this post.

Where is Iron Flask based?

This company is based in Tampa, Florida. The company was launched in 2016.

Is Iron Flask made in China?

Yes, all Iron Flask products are made in China. However, this doesn’t mean that the products are of lower quality.

Is Iron Flask a good company?

Yes, Iron Flask is a good company. It works hard to incorporate sustainability into its products while maintaining high construction quality. This company is also passionate about creating a community around its products.

As such, it’s known to regularly partner with and donate to those that share its values.

Are Iron Flasks worth it?

Yes, they are worth it. This is because:

1. They come with a lifetime warranty

One of the greatest things about Iron Flasks is that they come with a lifetime warranty that covers manufacturing defects. To get a replacement or refund from the company, all you have to do is send an email to Keep in mind though – this warranty doesn’t cover modifications, wear and tear, and any damage you do while cleaning.

2. They are made from premium materials

Iron Flasks are made of high-quality stainless steel and have double-wall vacuum insulation. Ultimately, their materials and construction make them light, durable, and efficient.

3. They keep you from contributing to plastic pollution

Like all metal reusable bottles, Iron Flasks keep you from adding plastic bottles to landfills. Ultimately, this is good for the environment and even your pocket.

4. They are packed with useful features

Iron Flasks come with built-in features that particularly make it easy to carry them with you when you travel. For one, each bottle usually has an integrated handle that makes it easy for you to grip your bottle when on the go.

Secondly, each has a carabiner that you can clip onto the loops of your backpack. And to top it all off, each water bottle has a design that’s compatible with cup holders.

5. They come in a variety of styles and sizes

If you’re looking for a stylish water bottle that fits in with your lifestyle, an Iron Flask could be just what you need. These bottles come in a variety of colors, shades, and patterns. Some are covered in a plain dark color while others have several shades of pastels – some even have kid-friendly patterns.

Also, these bottles are available in a variety of shapes and sizes. The three main shapes available are retro, wide mouth, and narrow mouth. Wide-mouth water bottles are particularly popular among those looking for something easy to fill.

The sizes available are:

  • 14 oz
  • 18 oz
  • 22 oz
  • 32 oz
  • 40 oz
  • 64 oz
  • One gallon

Keep in mind though – even though the four largest sizes have cup holder-friendly designs, they won’t fit in most backpack, car, and bike cup holders.

1. They can come with free accessories

Another thing that makes Iron Flask bottles worth it is the fact that they can come with free accessories. The bottle with a straw line of products particularly comes with three free leak-proof lids.

This gives you the versatility that many bottles don’t provide. Another thing you need to keep in mind is that you can easily replace these lids or buy other accessories from Iron Flask.

Some accessories you can look into buying are:

  • Paracord handle – this is an important accessory for anyone who buys a wide-mouth Iron Flask bottle that they plan to take with them on outdoor adventures
  • Protective boot – this is made of scratch-free, BPA-free, flexible silicone. You can use it to cover your bottle and protect it from any dents and scratches. It can also be used to add some style to your bottle, particularly because it comes in a variety of colors. It is available for all bottle sizes and has a streamlined design that is compatible with cup holders

Is Iron Flask just as good as Hydro Flask?

While both the Iron Flask and Hydro Flask are good reusable water bottles, the former is a better choice. It is available in more sizes and colors and even comes with more lids.

However, its biggest advantage over the Hydro Flask is the fact that it can keep drinks hot for longer. Keep in mind though – it can’t be washed in the dishwasher like the Hydro Flask.

Are Iron Flask water bottles safe?

Yes, these water bottles are safe. Since they are made of stainless steel, they are BPA- free and non-toxic.

Do Iron Flasks leak?

No, Iron Flasks don’t leak. Their lids have screws on top that prevent leaking.

Do Iron Flasks dent easily?

No, such bottles don’t dent easily, even when used regularly. As long as you take care of them and don’t drop them unnecessarily, they usually remain dent-free for a long time.

How often should I wash my Iron Flask?

It’s advisable to wash your Iron Flask after every use or daily. This should be followed by a thorough cleaning at the end of the week.

How do you clean the inside of an Iron Flask?

You should use warm soapy water and a dedicated bottle brush to clean the inside of an Iron Flask – the Retro bottles even come with a specially designed brush for this purpose.

  1. To clean the outside of an Iron Flask, you can use the same solution and a sponge. Once you’re done, thoroughly rinse the bottle and leave it out to air dry.
  2. If your bottle still has spots inside after your usual cleaning process though, you’ll have to use distilled vinegar. Just add ¼ to ½ cup of this chemical into your bottle and swirl it a bit.
  3. Afterward, let it sit for 5 to 10 minutes – this usually gets rid of most spots. But if this doesn’t work, you will have to use a baking soda paste as well. To do this, add a bit of water to 3 teaspoons of baking soda until you have a paste, and then use a brush to scoop it and scrub the spots away.
  4. Once you’re done rinse the bottle as usual and leave it out to dry.
  5. As for accessories like straws and lids, you can clean them in the dishwasher. Just stack them with the other dirty utensils in there or put them lengthwise on the top rack. If this doesn’t work for you, hand wash them using warm soapy water and a small brush.

After all, some small appropriate brushes come with all replacement straw lids.

What happens if I put my Iron Flask in the dishwasher?

If you put your bottle in the dishwasher, the hot temperatures in there can damage its powder finish.

Can you put Iron Flask in the fridge?

No, you can’t put your Iron Flask in the fridge or freezer – this can damage it. What’s more? Doing so won’t make your drink colder or even keep it from getting warm for longer.

This is because these bottles have vacuum insulation that protects their contents from the effects of external temperatures.

How long does Iron Flask keep drinks cold?

Generally, Iron Flask products keep drinks cold for up to 24 hours. However, the exact time your bottle can achieve is dependent on its model and size.

For instance, a 14 oz wide mouth Iron Flask bottle can keep drinks cold for up to 16 hours while an 18 oz to 64 oz one can do it for up to 24 hours.

On the other hand, all sizes of narrow-mouth Iron Flask bottles can keep drinks cold for up to 24 hours.

How long does ice stay in an Iron Flask?

Ice cubes can remain whole in this cup for up to 24 hours.

Can Iron Flask water bottles be used for hot drinks?

Yes, Iron Flask water bottles can be used for hot drinks. In fact, their insulation technology ensures that they can keep your drink hot for up to 12 hours. But again, the exact time limit of your bottle is dependent on its model and size.

While a 14 oz wide-mouth bottle can keep your drink hot for up to 8 hours, an 18 oz to 64 oz one can do it for up to 12 hours. When it comes to narrow-mouth bottles, the 12 oz ones keep your drink hot for 4 hours, the 16 oz to 24 oz ones can do it for 8 hours and the 32 oz to 64 oz ones can do it for 12 hours.

Can you put coffee/tea in an Iron Flask?

Regardless of temperature, you can put coffee and tea in an Iron Flask. Just ensure that you thoroughly clean your bottle afterward if your tea/coffee has milk. Leaving your bottle dirty for more than 20 minutes after this use can cause stains and smells.

Eventually, these will force you to use a cleaning method beyond the usual warm soapy water. You may have to use vinegar, baking soda, bleach solution, hydrogen peroxide, or water cleaning tablets.

Final thoughts

While Iron Flask water bottles aren’t perfect, they are one of the best choices out there. As long as you do enough research before you buy them and understand what to expect, you’ll be fine.

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