This 890ml large capacity straw tumbler is specially designed for modern lifestyle, crafted with high-quality stainless steel material and specially treated inner liner to preserve original beverage flavor without cross-contaminationThe rotating flat lid design offers convenient opening and closing operation, easily manageable with one hand, making it perfect for driving, office work and outdoor activities Double-wall vacuum insulation technology effectively maintains beverage temperature, keeping cold drinks chilled for hours and hot drinks warm with equal efficiency Multiple color options and lid choices cater to different user preferences, available in various shades from light blue, pink to black, navy blue and more Leak-proof design ensures safe carrying, no worries about leakage when placed in bags, making it your ideal travel companion Wide mouth design combined with food-grade materials makes daily cleaning and maintenance simple and efficient