Pioneer 35ml Food Storage Container

Only used once, I warmed the flask first with boiling water, put soup in it and 4 hours later it was still hot enough to eat, I think I needed more soup in it so that there was no gap at the top and it might have ten been hotter, I’m interested to know if it will keep solid food warm ?

Functional fir few months but now food gets cold.

Lovely large flask.

Excellent