Safe Material & High CapacityFAPPEN Double Walled Vacuum Flask Thermo is made of food upgrade 304 stainless steel on both inside and outside walls, 100% BPA-free, which works better on anti-oxidation, corrosion resistance and temperature retention; It is a healthier choice as water bottle for tea, coffee, cold drink with ice cubes, etc. Vacuum Insulated Water BottleThanks to the premium coated copper on the exterior of the inner wall contributes to added insulation, This vacuum insulated drink flask can keep hot for 12 hours or cold for 9+ hours, greatly protect the liquid compartment from the hot or cold outside, achieving in reducing temperature transmission in maximum Leak Proof & Sweat FreeDouble lid locks of bottle and silicone rubbers ensure no leak even the water bottle is tipped over or shaken; Coated with high-quality powder outside, this drink flask is anti-slip andoutstanding insulation, no matter the temperature of the liquid in this bottle, it will never sweat or be hot to the touch Friendly Design for One-Hand OperationThis ergonomically shaped vacuum insulated bottle allows one-handed operation by briefly releasing and pressing the side button, fits most cup holders and makes a perfect travel companion; Especially suitable for drivers and students and perfectly suitable for daily use, running, hiking, and camping