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When I did that I used to use one of these
https://thermos.co.uk/stainless-kingtm-food-flask-470ml
Heat it up at home and put it in there in the morning and it's still boiling at lunchtime.It went in my carradice with a d-lock and tools and although the outside got bashed it was only cosmetic.
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https://black-blum.com/products/stainless-steel-box
Vacuum works well, and will probably outlast the IKEA glass ones by years.
I take a small pot of homemade soup to work everyday and microwave to warm it up. I currently use plastic pots but they are getting very scabby and would like to avoid buying plastic again.
Does anyone know of a microwave friendly stainless container around 300-400mls with a good sealing lid?
I commute by bike so want to avoid anything breakable.