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How do vacuum flasks keep hot liquids hot, and cold ones cold? - Quora
Amazon.com: FEIJIAN Coffee Thermos with Cup,21 OZ Stainless Steel Water Bottle, Vacuum Insulated Water Bottle, Thermos for Hot Drinks/Cold Drinks, Leakproof Build-in Lid Cup Integrated Handle, Black: Home & Kitchen
Amazon.com: Vacuum Insulated Bottle Coffee Thermos,41 Ounce,Thermos for Hot Drinks,Keep Liquid Hot or Cold 24 Hours,Thermos & Perfect Size Cleaning Brush,Portable,Bpa-Free Termos Para Cafe: Home & Kitchen