Hydro Flask 21 Oz Standard Mouth

Your Perfect Travel Companion!



Hydro Flask 21 Oz Standard Mouth

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Your Perfect Travel Companion

Keep life moving with our 21 oz bottle and Standard 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.


Our unique double wall vacuum insulation protects temperature for hours. Cold drinks stay icy cold and hot drinks stay piping hot so you can stay refreshed for any adventure.

Pro-Grade Stainless Steel

Made with 18/8 pro-grade stainless steel to ensure pure taste and no flavor transfer – and the durable construction stands up for whatever life brings.

Proprietary Powder Coat

Our proprietary powder coat means an easy-grip, sweat-free, and extra-durable bottle that you can take anywhere.

Size & Dimensions

Size: 21 oz
Volume: 621 mL
Mouth Diameter: 1.91″
Diameter: 2.81″
Height: 9.4″
Weight: 11.3 oz

Product Benefits

  • Versatile, middle-of-the-road size
  • TempShield™ insulation eliminates condensation and keeps beverages cold up to 24 hours and hot up to 12 hours
  • Durable 18/8 Pro-Grade Stainless Steel construction
  • BPA-Free and Phthalate-Free
  • Compatible with Standard Mouth Insulated Sport Cap
  • Lifetime Warranty


Stone Style# S21SX010
Sunflower Style# S21SX720
Olive Style# S21SX306
Hibiscus Style# S21SX650
Fog Style# S21SX508


Hydro Flask

Let’s Go. And when you do, our gear will be there to make each and every outing all the more amazing. Today is wide open. And we’re up for anything.

Additional information

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