Hydro Flask 21oz Standard Mouth

Hydro Flask 21oz Standard Mouth
Hydro Flask 21oz Standard Mouth
Hydro Flask 21oz Standard Mouth
Hydro Flask 21oz Standard Mouth
Hydro Flask 21oz Standard Mouth

Hydro Flask 21oz Standard Mouth

Regular price $34.95 Sale price $24.00

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Keep life moving with Hydro Flask's 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.

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

Size & Dimensions

Capacity 21 oz
Volume 621 mL
Diameter 2.81"
Mouth Diameter 1.91"
Height 9.4"
Weight 11.3 oz


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.

Color Last™ Powder Coat

Our proprietary powder coat is dishwasher safe, and your bottle stays slip-free and colorful, no matter where you take it.

Let's Go!

We make thoughtful, beautifully designed gear that moves people. Towards nature. Towards happy. And towards each other. Because life is an adventure and we’re glad to be with you for every step, sip, and smile along the way. Come on.


The only thing we love more than spending time in natural places is helping share that experience with others. That is our purpose and our heartbeat. Whatever you need to help you be outside living your best life, we're in.


Mother Nature is the best designer there is. There’s never anything extra —every choice is made for a reason. That's our inspiration behind every product we design. Keep it strikingly simple. From product innovation to color leadership - simplicity drives all.

Customer Reviews

Based on 11 reviews
Thach D.
Great product and super fast

Great product and super fast shipping.

Ileana Z.
Loved it! Got the pineapple

Loved it! Got the pineapple color beautiful and it arrived super quick thanks!

Aida G.
Quality water bottle.

For several years, Hydro Flask has been our family's go-to water bottle. They're entirely metal (with the exception of the lid), long-lasting, and insulated. Aftermarket lids are also available, such as the Flaskars Straw Lid for Hydro Flask Standard Mouth Sport Water Bottle, which has a built-in, leak-proof straw (we prefer this to their sport cap offering).

MOSTLY amazing

I enjoy the Hydro flasks and have several of them for different occasions. However, there are a few advantages and disadvantages to these bottles. Pros Water stays cold for up to 24 hours when double insulated. Lids with a wide opening and several types of lids are available. There are no leaks. Handle strap - Carry it by hand wherever you go. Design is sleek and elegant, and the grip is non-slip. Cons. It can develop scratches and dents if you aren't careful. Hand wash only / dishwasher not recommended Over time, the handle strap will most likely wear out. The disadvantages are minor in comparison to the advantages, but I like my bottles to last a lifetime, so I usually find a sleeve to protect them from dents or damage over time.

Best water bottle I've owned!

Everyone seems to have Hydroflasks, so I wanted one. The price threw me off at first. After a few months of use, it has certainly met and exceeded my expectations. What's important is that the bottle's insulation remains intact. Seriously. I'm usually at the office all day, so the insulating effects aren't noticeable. Sure, it's chilly at the office all day, but that doesn't matter until you take it to Arizona and leave it in a hot car for 3+ hours in 107-degree heat, only to return and find it still ice cold.

Awesome. It has a nice grip, a convenient handle to swing it by, and when it knocks somebody in t...

I've had this for two weeks and I'm in love. I've already taken it on a plane, taken it to the beach, ridden it to and from work every day on my bike, and then dropped it on the floor. I've never used an insulated bottle before, so having cold water all day has been a pleasant surprise. I haven't gotten the 6/8+ hours of ice that other people claim, but I also don't use much ice and sometimes don't seal the top out of laziness. Easy to grasp, the insulation prevents moisture, and the water appears to resist even when it runs down the edges. The best feature is that it sounds like a low, quiet gong when you bump it against things.

Hailey J.
I will never not support Hydroflask

This is my SIXTH HydroFlask, and I'm confident it will not be my last. My sole reason for buying so many is that they make great gifts, and I like to treat myself to a new one every year to vary up the color.

I've bought 3 of these I love them so much

Hydro Flask is fantastic as always. This is my third Hydro Flask water bottle, and I appreciate how cold my water stays for up to 24 hours. I've dropped it a couple of times and it hasn't chipped or scratched in any way. Great color selections, especially the Pacific Blue, which is very bright! Just a reminder to clean your water bottle on a regular basis. Even if you simply drink water from it and drink from it on a daily basis, bacteria may and will build up if you don't wash it, and you'll end up with a sore throat as I did.