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Double Stainless Steel: This thermos bottle is made of stainless steel, both inside and out. The inner wall prevents odors from reacting with the bottle, preserving the original taste of the beverage. Furthermore, the outer wall is drop-resistant, minimizing surface damage and internal structural deformation during daily use, ensuring long-lasting stability. This double-steel design ensures clean storage and resists bumps and dents during daily use. The thermos bottle is suitable for various dynamic environments, such as sports and commuting, and remains in excellent condition even with frequent use. 600 ml Capacity: The thermos bottle has a capacity of 600 ml per cup, meeting the daily drinking needs of adults without requiring frequent refilling. Due to its large capacity, the thermos bottle is easy to carry, fitting easily into a backpack side pocket or a handbag. The simple, elegant black design is versatile and suitable for any occasion or style. Whether you carry it in your hand for your daily commute or hang it on a backpack while working out, it maintains a sleek, stylish appearance and meets the daily hydration needs and aesthetic preferences of most people. Dual-effect temperature lock: The thermos bottle features vacuum lock technology, which retains heat for 6-12 hours. It offers both hot and cold functions. In winter, hot water maintains a comfortable drinking temperature for hours, meaning it does not need to be reheated often. In summer, ice water retains a cool temperature for a long time, ensuring a refreshing taste. This dual-effect temperature lock meets the temperature needs of beverages all day long and at all times. Whether it is hot coffee in the morning, hot water for sports, or ice-cold drinks for summer outings, the thermos bottle maintains the ideal temperature, enhances the drinking experience, and reduces waste due to temperature fluctuations. Multifunctional portability: The thermos bottle has a non-slip handle and a keychain. The hanging design makes it flexibly portable. It can be attached directly to the outside of a backpack or bicycle frame, or to a suitcase or sports bag using the keychain, eliminating the need for internal space and preventing spills. The non-slip handle provides a firm grip, even with sweaty hands, minimizing the risk of the thermos tipping over. This portable design is suitable for various situations, such as sports, commuting, and travel, ensuring drinking water is always within reach and the thermos is easy to carry.