Beneunder introduces the breakthrough Lightweight Insulated Flask, crafted using advanced lightweight plastic molding and spinning technology. Weighing a mere 210g, this flask is designed for ultimate portability, making it your perfect companion for outdoor activities. The curved bottleneck design enhances ease of handling. Moreover, it offers impressive thermal and cold insulation for over 6 hours. Additionally, featuring integral stretching technology, the seamless, one-piece inner lining is free of welding seams, ensuring no stains or hidden residues, making it effortlessly easy to clean after prolonged outdoor use. Product Highlights: Lightweight and Portable Curved Bottleneck Over 6 Hours of Thermal and Cold Insulation Seamless Integral Lining