At a full half gallon the Insulated Classic 64oz (1900ml) is our largest insulated stainless steel water bottle, perfect for long trips and serious hydration needs. We test our double-wall vacuum insulated performance constantly and our 64oz has serious performance, keeping drinks hot for 30 hours and iced for 100 hours. Electropolished interior, a process that is safe and non-toxic, and rounded corners make the bottle easy to clean. The included Loop Cap helps keep the contents hot or cold, is easy to clean and leak proof. FEATURES Double-Wall Vacuum Insulation, Keeps Hot up to 30 hours, Keeps Iced up to 100 hours Food Grade 18/8 Stainless Steel Construction Comes with Leak Proof Loop Cap Compatible with all Klean Kanteen Classic Caps Large 1.75" (44mm) opening, for easy filling and pouring Hand Washing Recommended for Insulated Products Backed by the Klean Kanteen Strong as Steel Guarantee   SPECS Capacity 64 fluid ounces (1900 ml) Weight (w/loop cap) 26.9 ounces (762.3 g) Size (w/loop cap) 12.6" H  x 4.65" W (319.5 mm H x 119.4 mm W) Opening Diameter 1.75" (44 mm)