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Theoretically, a 1L flask will keep the liquid warmer as there less surface area and greater mass. However, in practise it is really a question of what size insulated (Thermos/vacuum type) flasks ...
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Theoretically, a 1L flask will keep the liquid warmer as there less surface area and greater mass. However, in practise it is really a question of what size insulated (Thermos/vacuum type) flasks ...