Like all typical thermos bottles, it has a screw-on lid that also serves as a drinking cup. However, this lid is slightly wider than those of many other models and fits flush with the bottle, making it easier for you to pack and unpack. Instead of using a continuous thread, Klean Kanteen has incorporated several round indentations in the Thermal Kanteen TKPro, allowing you to pour your drinks even with the lid partially screwed on. At the same time, it avoids small, hard-to-clean pouring mechanisms, preventing unsightly deposits from forming. The silicone seal on the screw lid reliably keeps the cold or hot contents inside the vacuum-insulated bottle. The TKPro can keep drinks hot for up to 28 hours and cold for 90 hours, making it ideal for all longer outings where you don’t want lukewarm beverages at the end of the day.