The 16oz 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 24 hours. Keeps drinks hot for up to 10 hours. Durable construction built for daily use. BPA-free throughout. Specifications: 16oz capacity | 18/8 BPA-free stainless steel | BPA-free | Keeps cold 24 hours | Keeps hot 10 hours Shop all Thermos® drinkware or view best sellers . Double-wall vacuum insulation keeps drinks cold 24 hours and hot 10 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 the full Thermos® tumblers and mugs collection , view best sellers