The multi-layer insulation technology features: the first layer is a thick food-grade 18/8 stainless steel inner wall; the second layer has a copper plating that reduces heat transfer; the third layer is a vacuum layer that prevents heat loss. As a result, you can enjoy an insulated water bottle that keeps beverages cold for up to 48 hours and hot for up to 24 hours. | Highly Attractive Bag | 100% Leak-Proof: Toss it in your bag or car without a second thought! With our leak-proof thermos, you’ll never have to worry about unwanted spills ruining your day. | PORTABLE DESIGN: With Durable Paracord Handle, you can easily take your thermos outside for exercise, skiing, fitness, yoga, hiking, camping,outdoor adventures, and more. | Rich Practical Accessories