A vacuum for the stainless steel vacuum bottle between the layers of the glass/stainless steel refill helps prevent heat conduction and radiation. http://www.chinaflasks.com/stainless-steel-vacuum-bottle/
A vacuum for the stainless steel vacuum bottle between the layers of the glass/stainless steel refill helps prevent heat conduction and radiation. http://www.chinaflasks.com/stainless-steel-vacuum-bottle/
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