Often forgetting to close your bottle properly before putting it in the bag? With the new JNS-450 one-push tumbler, you do not have to worry. Equipped with a new auto-lock button, your bottle is locked once the lid is closed. That means no more accidental spills, and one less hassle off your mind. Lightweight with slim contours, it is ultra-handy to be put in and taken out from your bag effortlessly. With vacuum insulation technology for maximum temperature retention, you can now enjoy your hot or cold beverage in your Thermos tumbler at any time of the day.