Can You Put Soda in a Hydro Flask?

Are you able to put soda in your Hydro Flask or will it cause damage to your Hydro Flask and make it taste bad or leech metals into your drink?

Hydro Flasks are amazing at keeping water cold all day, being able to keep ice for 24+ hours.

For those who prefer drinking soda throughout the day instead of water or coffee it's important to know if you can put soda in your Hydro Flask or not.

I love my energy drinks so I did my research to answer this once and for all:

Most people believe it's fine to put soda in a Hydro Flask. The airtight bottles will keep your soda fizzy and research suggests the soda, while acidic, should NOT affect the stainless steel metal Hydro Flasks are made from. However, some people claim it creates a metallic taste or can leech metals into your drinks.

Ultimately there is no definitive answer on this one, however I have done a fair amount of research which I want to share with you.

See the latest prices of Hydro Flask bottles at

What Are The Risks of Putting Soda in a Hydro Flask?

What exactly is it about soda that makes people concerned about drinking it in their Hydro Flask? What potential risk does it have that could cause issues?

Well there are a few major concerns here:

Carbonation and Expansion Breaking Your Bottle

Soda contains carbon dioxide which creates it's fizziness. The dissolved carbon dioxide expands into gas creating pressure.

There is some concern that Hydro Flask's can't handle this pressure and that the inside or the insulation will be damaged as a result.

However, this is not true.

Hydro Flasks can easily handle the pressure from carbonated beverages. You may have a surge of pressure release as you open your bottle it shouldn't cause any damage.

Some people get super unlucky and their Hydro Flasks break as a result of putting soda in it. But this is very rare and it's likely Hydro Flask would replace your bottle under their lifetime warranty anyway.

Check out the story below from this Facebook post:

When I had sparkling water in mine, the lid popped off a good 15 feet when I turned it to open it and the inner ring also popped out of it.

Acidity Corroding The Stainless Steel

You may not realise it because they are so sweet but sodas are actually quite acidic.

They have a PH level ranging from 2.38-3.70 for most sodas. This means they can be as much as 100,000 times more acidic than water.

This makes soda highly corrosive and people worry that extensive contact with stainless steel could cause micro particle leeching with could ultimately cause your soda to taste like metal and you to be consuming micro particle corrosion.

There is no clear evidence of this and wikipedia states that stainless steel resists corrosions of most acids including phosphoric acid found in coca-cola:

All types of stainless steel resist attack from phosphoric acid and nitric acid at room temperature.

Build Up of Residue

Leaving soda in a Hydro Flask can cause a build up of residue on the walls of your Hydro Flask which is hard to clean off without srubbing it with an abrasive cleaner.

This can be hard to do as the bottle mouth openings aren't large enough to fit your hand in. Click here to learn how to clean stains from a Hydro Flask.

What Does Hydro Flask Say About Soda In Their Bottles?

I searched the web to find out what Hydro Flask says about soda in their bottles.

This issue isn't discussed anywhere on their website but I did find some responses on Facebook and Amazon.

In this facebook post someone asked “Can you put carbonated drinks in a Hydro Flask” and the company responded with “You can!”

In response to this question about sparkling water in a Hydro Flask:

Hello Gail – Shannon from Tall Ridge here – Yes, sparkling and carbonated beverages can be used with the Hydro Flasks. Please let us know if you have any other questions.

Tall Ridge is the company that that exclusively sells to Hydro Flasks bottles on Amazon, and they are legit.

They also gave an answer on this question about soda in a Hydro Flask:

Hello Tyler – Wendy from Tall Ridge here – Thank you for your inquiry! You should feel assured knowing that our Hydro Flasks have been thoroughly tested with all standard consumption beverages such as water, tea, coffee, beer, wine, cocktails, kombucha, soda, etc. I hope that helps!

See the latest prices of Hydro Flask bottles at

What Do Other Companies Say About Soda In Their Bottles

There are a lot of different bottles like Hydro Flask which seem to work just as well and be of an equally high quality.

Cambak said on this FAQ page:

Just about anything (milk, juice, sports drinks) works as long as you clean your bottle after each use. We don’t recommend putting carbonated beverages in the eddy, since the pressure can cause liquid to spurt out of the straw. However, it’s fine to put carbonated drinks in the Chute or Podium series bottles.

What Do Regular People Say About Soda in Hydro Flasks?

There are a lot of people asking this same question on places like Reddit, so below are some of the responses to the question “can I put soda in my Hydro Flask”

I do everyday, just be careful when you open.Reddit

I've used mine for years with lemonade and soda with no issues. The only drink I avoid is dairy based. Forgotten dairy funk is awful to wash out of plastic, and buying new lids is a pain. – Gina Starke on Reddit

When looking into if you can put lemon juice in a Hydro Flask a lot of people out there claimed that lemon juice caused a metallic taste in their Hydro Flask.

However, I did not find this when looking into soda.

I am yet to see one complaint about metallic tasting soda in a Hydro Flask. I am unsure if this is due to lemon reacting more with stainless steel or to people just not being able to taste it through the sweetness of the soda.

Soda Is Made In Stainless Steel Tanks

While a lot of sodas are now sold in plastic bottles they are mostly made in large stainless steel barrels or vats before they are packaged into plastic.

The stainless steel used in these factories where they make the soda is likely of of a similar grade to that used in Hydro Flasks.

So your soda has likely spent a great deal of time inside stainless steel before ever making it to the super market shelves and into your Hydro Flask.

Will Soda Stay Fizzy In a Hydro Flask?

Soda loses it's fizz when exposed to outside air, so having an airtight container is paramount to stopping your soda from going flat.

One interesting thing to note is that soda keeps it's fizz more at lower temperatures than it does as high temperatures. So keeping your soda cool also helps to keep it fizzy.

Do you know of a bottle that keeps things cool all day and is completely air tight? Yup that's right the Hydro Flask.

A Hydro Flask will keep soda fizzy and stop it from going flat because it's airtight and because it keeps the soda cold which helps it stay fizzy longer. For best results completely fill your Hydro Flask with soda and have as little air in your Hydro Flask as possible.

Just be careful of the release of gas as you open your Hydro Flask bottle.

One customer said it shot her lid 15 feet into the air!

Will The Phosphoric Acid in Coca-Cola Corrode Stainless Steel?

Coca-cola contains phosphoric acid which is actually great for dissolving and removing rust. It's actually one of the best things to use to clean rust from a Hydro Flask.

Stainless steel is resistant to phosphoric acid and should not react with it. It will dissolve and remove rust, but it won't cause corrosion or rust on your stainless steel.

So you should be safe to use coca-cola in your Hydro Flask.

See the latest prices of Hydro Flask bottles at

Can You Put Carbonated Drinks In a Hydro Flask?

It is safe to put carbonated drinks in Hydro Flasks. The stainless steel and airtight container can handle the pressure from carbonation and will actually work to keep your drink from going flat.

Can You Put Sparkling Water In A Hydro Flask?

It is safe to put sparkling water in a Hydro Flask. The stainless steel walls of the Hydro Flask is strong enough to withstand the pressure from carbonation and the water isn't acidic so it won't cause any corrosion. Given Hydro Flasks are airtight and keep drinks cold they also help to keep your sparkling water bubbly all day long