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If you don’t have a kitchen at work or somewhere to plug an electric lunch box in, then its old school and a thermos food flask.
Thermos is one of the oldest and most respected names in the vacuum flask industry and this 470ml flask will keep your food warm for up to 9 hours.
It has a stainless steel inner and outer skin and a stainless steel lid which doubles up as a serving bowl, it even has a handy folding spoon included.
Being a Thermos the flask is covered by a 50-year guarantee.