The Hydro Flask 21oz Standard Mouth Water Bottle offers long-lasting temperature control, keeping drinks cold for 24 hours or hot for 6 hours. Its 18/8 pro-grade stainless steel construction prevents flavor transfer, ensuring pure taste. Ideal for daily hydration, this BPA-free, phthalate-free bottle fits most car cup holders and backpack pockets. Features a durable, sweat-free powder coat finish and is compatible with Hydro Flip Lid and Wide Straw Lid options. With a TempShield protected design, it also fits most backcountry water filters for versatile use. Enjoy the perfect companion for all your hydration needs.