Stainless Steel Vacuum Flask: The High-Quality Double-Layer Stainless Steel Vacuum Insulation Structure Enables The Stainless Steel Vacuum Flask To Keep The Temperature Of Hot And Cold Drinks For Several Hours- The Flip-Top Lid With A Safety Lock Makes Drinking More Convenient And Prevents Drinks From Overflowing- 1-5/8 Inch (4 Cm) Wide Diameter- In Addition To The Original Flip Cap, An Optional Flat Screw Cap (Sold Separately) Can Be Added For Easy Sipping- Lightweight And Compact Design- The Easy-To-Clean Double Non-Stick Coating Liner Improves The Durability Of The Product And Protects The Stainless Steel From Corrosion By Salty Drinks Such As Sports Drinks- Specifications: Capacity: 20 Oz- / 0-60 Liter- Dimensions (W X D X H): 2-3/4 X 2-7/8 X 10-1/4 Inches- Weight (Lbs- Oz-): 0-09- Heat Retention: 190 Degree F At 1 Hr- / 163 Degree F At 6 Hrs- Cold Retention: 46 Degree F At 6 Hrs- Zojirushi, Japan Top Home Appliances And Vaccum Insulated Products, Since 1918-