3 Cup Double-Layer Stainless Steel Vacuum Flask

sets of stainless steel vacuum flasks with accompanying mugs. These sets are designed to keep beverages hot or cold for extended periods, making them suitable for travel, outdoor activities, or office use. 
The flasks are typically made of high-quality, food-grade stainless steel. 
They are designed with vacuum insulation technology to maintain the temperature of drinks for up to 12 hours. 
The sets often include a thermos bottle and multiple cups, sometimes with the bottle lid doubling as a cup. 
These flasks are leak-proof and portable.