The 24oz Alta Water Bottle from Thermos® is a 18/8 BPA-free stainless steel vacuum insulated bottle designed for active lifestyles and everyday hydration. Keeps drinks cold for up to 18 hours. Durable construction built for daily use. BPA-free throughout. Specifications: 24oz capacity | 18/8 BPA-free stainless steel | BPA-free | Keeps cold 18 hours Shop all Thermos® drinkware or view best sellers . Double-wall vacuum insulation keeps drinks cold 18 hours by eliminating heat transfer between the environment and your drink. Two walls of 18/8 stainless steel with the air removed between them means no medium for heat to conduct through — your drink stays at temperature whether the bottle is sitting in a hot car, on a sunny trail, or on a desk all afternoon. Sweat-proof exterior stays completely dry. For best performance: pre-chill with cold water for a few minutes before filling, fill as close to the top as possible to minimize air space, and keep the lid sealed until you drink. Genuine Thermos® replacement lids and parts available at thermos.com/collections/accessories. Dishwasher safe — top rack only for lid components. Shop all Thermos® drinkware or view best sellers .