sanju (India)
Diposable hotglass
There should be some kind of glass or mug which heats the liquid which it holds inside it and keeps it hot for a long time. As soon as the liquid is put inside the container the liquid reacts with the chemical coating inside the mug and starts a heating process which heats the liquid. And which can be disposed of after a single use.

Reward: let me have 1 of it

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