Can you put soda in a thermos?

Can you put soda in a thermos or will it actually damage your thermos, make your soda taste bad or potentially even leech metals into your drink?|
If you can put soda in a thermos, will it keep it fizzy or will the soda lose all of its carbonation?

It’s completely fine to put soda in a thermos bottle, cup or flask. The airtight thermos will keep your soda fizzy and the vacuum insulation will keep it cold. Research shows soda should NOT affect stainless steel but some people claim their thermos imparts a metallic taste into their soda.

Why are people worried about drinking soda out of the thermos? What could potentially cause any issues and is there actually anything to be worried about here?

Well it turns out there’s actually a few reasonable concerns people have about putting soda in their thermos.

When placed in a bottle the carbon dioxide wants to expand into gas and this creates pressure inside the can or bottle.

So you can understand that people get concerned that this pressure could be too much for the thermostat handle and it may actually break the furnace or ruin the insulation. However this isn’t the case.

Thermoses and other vacuum insulated cups and bottles can easily handle the pressure created by soda or sparkling water.
You may get some pressure release when you open your thermos but it’s not going to cause any damage.

However, you do need to be aware of this, as it could be potential to cause your thermos lid to get stuck and be difficult to open. Also it’s a good idea to be careful when unscrewing the lid of your thermos when you have soda in your cup or bottle.

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