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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

Love it.

  • Familiarity: I've put it through the wringer

It is a Hydro Flask so you get the performance of one. This one is great because it still fits in your cup holder in your car. I always fill this up when I leave the house so I have cold water in the car.

5 5

Essential for every adventure

  • Familiarity: I've put it through the wringer

I don't leave home without this! It's durable and keeps my water cold. This is a simple and effective design that gets the job done!

4 5

hot and cold

  • Familiarity: I've put it through the wringer

1. It keeps hot things hot and cold things cold for a long time. I have filled this bottle with hot tea at the house put the cap on and went to take a drink 6 hours later up skiing and it is still too hot to drink.
2. It has a quality look and feel. The coating on the outside (mine is black) hasn't flaked off or scratched.
3. This bottle is fairly dent resistant compared to other metal bottles I have had.

1. If the cap is over tightened the treads on the inside of the bottle can strip out and cause it to leak. Mine was easily warrantied.
2. The lack of a tether between the bottle and cap mean that gloved hands can easily drop it and leave you fumbling for it in the snow.

5 5

Guys.. lets talk

  • Familiarity: I've put it through the wringer

Simple.... keeps ice and water cold for 24 full hours and hot for 12. Awesome for soup or coffee!

Best Best BEST part.. the lid is insulated as well. Yup. So you don't have to worry about any heat getting in or out of the lid. Not a lot of bottle companies do this. Very impressed yet again Hydroflask

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.