Keep life moving with our Hydro Flask 21 oz standard mouth flex cap. It stashes easily into a small shoulder bag, your pack’s side pocket, or your car cup holder, and holds enough ice cold goodness to keep you going for hours without weighing you down. No wonder it's one of our bestselling water bottles.

Hydro Flask 21 oz Standard Mouth Flex Cap Product Benefits and Features

• Easy to Transport
• Fits with the 21-ounce Hydro Flask bottle
• TempShield^TM 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 (or our Stainless option)
• Lifetime Warranty
• Compatible with Standard Mouth Insulated Sport Cap