Premium 750ml Double-Walled Vacuum Insulated Flask with 24-Hour Temperature Retention This high-performance stainless steel flask features advanced double-wall vacuum insulation with inner copper coating, maintaining beverages at optimal temperatures for 24 hours. The precision-fit flip lid ensures leak-proof performance while allowing one-handed operation, doubling as a convenient drinking cup. Designed for maximum efficiency, the flask should be pre-conditioned and filled to capacity for optimal temperature retention. The included protective jacket provides additional insulation and protection, with color/design variations possible due to mixed inventory. Tested against rigorous quality standards, this reliable and convenient solution is perfect for tea brands and distributors seeking premium temperature retention vessels.zq20260205091006