The Hydro Flask Standard Mouth 621mL | 21 oz. Bottle is a vacuum-insulated, sweat-free water bottle that keeps cold drinks cold for up to 24 hours, and hot drinks hot for up to 6 hours. It fits easily into a small shoulder bag or your travel pack’s side pocket, and holds enough life-enriching hydration to keep you topped up for hours. 

• TempShield double-wall vacuum insulation
• Signature powder coat
• Durable 18/8 pro-grade stainless steel construction
• BPA-free and phthalate-free
• S21SX-DEW