The 24oz TriMax Insulated Stainless Steel Water Bottle Eco Vessel keeps liquids cold for 36 hours and hot for up to 8 hours. Zen's Tea House uses this thermos, perfect for tea, at all their tea locations. Because of it's built-in tea strainer it is perfect for making herbal blends, just throw a few of your favorite herbs or flowers with hot water and you have your drink ready to take where ever you go.