The Hydro Flask 21 oz. is the perfect go-anywhere companion on your busiest days. It stashes easily in a small shoulder bag, your pack’s side pocket or your car cup holder, and holds enough to keep you going for hours without weighing you down. The 21 oz. Standard Mouth is one of Hydro Flasks bestselling vacuum insulated water bottles because of its size and versatility.

• Easy to Transport
• Versatile, middle-of-the-road size
• TempShieldTM Protected
• Keeps cold up to 24 hours
• Keeps hot up to 12 hours
• 18/8 Pro Grade Stainless Steel
• BPA-Free and Phthalate-Free
• Durable, sweat-free powder coat finish
• Lifetime Warranty
• Compatible with Standard Mouth Insulated Sport Cap