[Stainless Steel]: This coffee mug is made of high-quality stainless steel, BPA-free, anti-oxidation, corrosion-resistant, and retains heat and cold. It's suitable for carbonating, coffee, fruit tea, milk, and more. It can easily satisfy your hot/cold beverage cravings and can be used year-round.[360° Waterproof and Leakproof]: Built-in silicone rubber ring + spiral cup stopper, double-layer leakproof design, no need to worry about getting wet when your backpack/keyboard falls, suitable for vehicles.offices, schools, daily life, etc.[Compact and Portable]: Comes with a strap, so it can be attached to a backpack or suitcase for travel. 400ml capacity, compact and portable. The striped design on the cup body provides a good grip and prevents slipping. The bottom of the cup is non-slip and wear-resistant. 【Thoughtful Design】: The cup lid features a straight top and can be opened with a tapped button, making it convenient for drinking. The wide opening allows for easy pouring and cleaning. 【Multi-scene application】: These colorful coffee mugs add a splash of color to everyday life. Suitable for many occasions: car, office, school, home, picnics, outings, travel, etc. They also make an ideal gift choice for birthdays, commemorative gifts, graduation gifts, back-to-school gifts, and more. 【Note】The color letter on the bracelet is random.