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Hydro Flask's most versatile and popular bottle, the 21oz Standard Mouth Water Bottle keeps your hot stuff hot and your cold stuff cold. 

  • Medium (standard mouth) opening
  • Double wall vacuum insulated
  • Keeps hot up to 12 hours
  • Keeps cold up to 24 hours
  • BPA-free
  • 18/8 stainless steel
  • Signature powder coat

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Hydro Flask 21oz. Standard Mouth Water Bottle

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Here's what others have to say...

5 5

Had to buy more than one!

  • Familiarity: I've put it through the wringer

I now have one of these in my gym bag and another that I keep at my desk. Water stays cold all day at work with a refill usually sometime in the middle of the day. The other one in my gym bag is awesome for staying hydrated while doing cardio or laying by the pool. Even in the blazing sun the ice is still there after several hours.

5 5


  • Familiarity: I've put it through the wringer

Hydro Flask is the best, hands down. I use mine daily... I own 4. I have gifted them to all of my friends and family. All of my coworkers now use them too. They are easy to clean, they keep things cold for days, no condensation and can withstand some serious abuse.

Hydro flask water bottle

Hydro flask water bottle

By far the best bottle. Keeps water cold for at least 24 hours. I take it everywhere I go. Narrow enough to fit in a full backpack, it's perfect. Very light and durable. Would recommend it to anyone. Buy the hydro flask.