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Soup flasks

Noticed this with flasks as well (stainless steel one), someone told me to "prime" it first.
Boil a kettle and put some water in the flask, put lid on and leave it for a couple of minutes. Pour out the water then put in your soup.
I use a Bento box


Then you can have any solid leftovers and stuff as well as just soup.

Also agree with the tip about filling it with hot water and then emptying it before putting your hot food in.

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