This stainless steel, double-walled vacuum shaker prevents water droplets from forming on the outside and prevents heat transfer, even when filled with hot drinks. It also prevents protein powder odors from absorbing. The interior has measuring marks, allowing you to make protein shakes without a measuring cup. The removable shaker net makes it easy to make powdered drinks. Its large 900ml capacity makes it perfect for sports and even for kids in extracurricular activities! It's also convenient for staying hydrated while working at a desk. The two-stage locking lid is certified in Sweden. It won't leak even when shaken, and won't open due to carbonation pressure, even when filled with carbonated drinks. The large opening when removed makes it easy to fit ice cubes. Even an adult's hand can reach the bottom, making cleaning a breeze. While hand washing is recommended, it is also dishwasher safe.