Can you put fizzy drink in a steel bottle /flask?

[ethan]

I recently purchased a small steel flask/bottle with the intent to use it to put cool coke/cola in it.
On taking the lid off the flask, the instructions placed inside say do not to put fizzy drink in it.

However, after researching a number of sites on the matter, many advise you can do so:

Can You Put Soda in Your Stainless Steel Bottle? | SustainabilityNook

Have you ever wondered if you can use your stainless steel water bottle for carbonated drinks like sodas? Will these fizzy drinks damage your bottle?

sustainabilitynook.com

 

[Vulcan]

ITT: How to build a pipebomb.

But yes, it's fine. Don't put a fizzy drink in the freezer though to cool it down, and then forgot about it. That was a big clean up.

 

[Chris Wilson]

The shape of it, the wall thickness of the stainless steel, the alloy of the stainless steel, and the integrity of any apertures may not take kindly to high internal pressures. Stainless steel is an alloy and some forms of it do "rust", the acidity of cola may degrade the steel and even contaminate the flask's contents. Some hollow shapes are far better at resisting internal burst pressure than others (cylinders are the conventional shape for pressure vessels).