Review: Vacuum-insulated flasks

August 2020

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August 2020

Which vacuum-insulated flask comes out tops in our test?
Wilderness tests three vacuum-insulated flasks that promise to keep drinks hot on cold winter days. How we tested For both hot water tests, we boiled water and filled each bottle to capacity. Before sealing the flask, we took a temperature reading of the water. That is our ‘start temperature’. For the daytime test, we imitated a […]
Alistair Hall

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Alistair Hall

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