Kamiizumi Stainless Steel Water Bottle, 900ml640ml, [One-Hand Automatic Switch, Leak-Proof], Vacuum Insulated, Keeps Hot or Cold, Portable, Large

[Why is it absolutely leak-proof?] Kamiizumi water bottles feature a double-layered, leak-proof cap. When the lid is closed, it creates a completely sealed space, eliminating the possibility of leaks. Please refer to the third image for the specific structure. The cap also features an air valve that equalizes the air pressure inside and outside the bottle. This means that even if the bottle is shaken in a bag and generates steam, you won't have to worry about getting burned by steam when you open it. [Easy to open in one second with one hand] Press the lid button with one hand to automatically open the lid. Closing is also incredibly easy; just push down the lid with one hand. This method is carefully designed with drivers in mind, and the large opening makes it extremely convenient. [Strong long-lasting heat and cold retention] According to test data from Kamiizumi's development department, when a water bottle was filled with 100°C water, the temperature was 44°C after 24 hours, and ice took 36 hours to completely melt. This is due to the efficient vacuum insulation, and our completely sealed cap design further improves heat retention. [All made with safe food-grade materials.] All made with internationally standard food container materials, so you can use them with confidence. There's no need to worry about odors or color fading. [Wide range of uses] Kamiizumi hopes to meet the diverse needs of our customers, and they can be used in the car, outdoors for camping, sports and fitness, work, cycling, travel, business trips, and more.