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A vacuum flask set typically includes a 500ml vacuum flask along with additional items like cups or mugs, a carrying case, and sometimes accessories like spoons or forks. The flask is designed to keep liquids hot or cold for extended periods by utilizing a vacuum-insulated double-wall construction. It's often made of stainless steel for durability and features a secure lid to prevent leaks. These sets are popular for outdoor activities like picnics, camping, or hiking, as well as for everyday use at work or home.