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Hydro Flask Stainless Steel Standard Mouth Water Bottle with Flex Cap and Double-Wall Vacuum Insulation

4.8 4.8 out of 5 stars 23,353 ratings

$28.65
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18 Oz
Black
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Purchase options and add-ons

Brand Hydro Flask
Capacity 18 Fluid Ounces
Color Black
Special Feature Bpa-free,Dishwasher Safe

About this item

  • TempShield️ double-wall vacuum insulation keeps drinks cold up to 24 hours, hot up to 12
  • Honeycomb️ Insulated Cap for maximum temperature retention
  • Made with 18/8 pro-grade stainless steel for durability, pure taste and no flavor transfer

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From the brand


From the manufacturer

Standard Mouth Flex Cap Water Bottle Hydro Flask
Standard Mouth Flex Cap Water Bottle Hydro Flask
Standard Mouth Flex Cap Water Bottle Hydro Flask
tumbler, tumbler with straw

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Hydro Flask Stainless Steel Standard Mouth Water Bottle with Flex Cap and Double-Wall Vacuum Insulation

Hydro Flask Stainless Steel Standard Mouth Water Bottle with Flex Cap and Double-Wall Vacuum Insulation


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Customer reviews

4.8 out of 5 stars
4.8 out of 5
23,353 global ratings

Customers say

Customers like the portability, size, color, leakage, and coldness of the water bottle. For example, they mention it's durable, has a handle on the cap, and fits in their car cup holder. Some appreciate the standard mouth size for sipping or pouring without any spills. That said, some complain about the flex cap providing a reliable seal.

AI-generated from the text of customer reviews

756 customers mention553 positive203 negative

Customers like the quality of thermos. They mention it's durable construction, and thoughtful design. They also appreciate its reliability, and say it'll keep liquid cold for around 6 hours with no ice. However, some customers report that it dents easily.

"...Cup Holder friendly in my old Jeep*Nice color*Sturdy constructionThis has absolutely ticked all of the boxes...." Read more

"...One of its standout features is its reliability – it doesn’t leak, even when tossed into a bag or backpack...." Read more

"This bottle is amazing!..." Read more

"The metal part of the mouth split causing my son to cut his lip pretty badly." Read more

651 customers mention569 positive82 negative

Customers like the coldness of the thermos. For example, they say it maintains their water super cold, holds temperature exceptionally well, and keeps the water fresh and cool for hours. It's also good at insulating and works for keeping tea hot for longer time.

"...It comes in a beautiful color, and its double-wall vacuum insulation keeps my beverages at the perfect temperature for hours...." Read more

"...Very sturdy, and keeps water cold without ice for a long time...." Read more

"...Drinks stay cold or hot a LONG time and it looks great. Ice water lasts for over two days! This is a must for plane travel as well as hiking." Read more

"...If you add a little ice, it will keep your drink cold for hours. Even overnight. The top is completely leak proof if you tighten it hand tight...." Read more

257 customers mention230 positive27 negative

Customers like the size of thermos. For example, they say it fits in their car cup holder, keeps water cold and is the perfect size. Some say the standard mouth size is just right for sipping or pouring without any spills. They also say it's slim enough to hold comfortably, very attractive without being showy, and the right height and width. Overall, most are happy with the size and functionality of thermo.

"...This has absolutely ticked all of the boxes.It's slim enough to hold comfortably, very attractive without being showy and well..." Read more

"...It carries exactly enough water for me at the gym and no more, plus its small enough that it never gets in the way much. Anyway, great water bottle!" Read more

"...They’re very durable. I love how they are to drink from, light-weight, beautiful colors, sweat proof, and so easy to clean...." Read more

"Got the stome grey color on sale for like $22. It is perfect. Fits into my car cupholder and my backpack side pocket, both sticking points for me...." Read more

235 customers mention228 positive7 negative

Customers are satisfied with the color of thermos. They mention it has a beautiful color, is stylish, and looks exactly like the photo. Some appreciate the color options, sizes, and that they don't leak. Some say that it's dishwasher safe and the quality of looks and feels nice. Overall, most are happy with the insulation capabilities and user-friendly design.

"...Cup Holder friendly in my old Jeep*Nice color*Sturdy constructionThis has absolutely ticked all of the boxes...." Read more

"...The flex cap ensures easy access while preventing spills. Plus, its sleek design adds a touch of style to my everyday routine...." Read more

"Bought it for the gym, and I love this little guy. Love the color too (pacific I think?). I use it at the gym every other day, couldn't be happier...." Read more

"...I love how they are to drink from, light-weight, beautiful colors, sweat proof, and so easy to clean...." Read more

149 customers mention125 positive24 negative

Customers like the leakage of thermos. They mention it does not leak at all, the secure seal of the cap prevents leaks, and the straw does not drip. The Flex Cap adds convenience, providing a reliable seal to prevent leaks and spills.

"...The flex cap ensures easy access while preventing spills. Plus, its sleek design adds a touch of style to my everyday routine...." Read more

"...No spill at all, mind you, this bottle is inside my backpack with my laptop all day and never had an accident!..." Read more

"My family loves the hydro flask brand because they don’t leak or spill. They’re very durable...." Read more

"...This is very durable and we have not had any issues with leaking...." Read more

123 customers mention116 positive7 negative

Customers are satisfied with the performance of thermos. For example, they mention it serves its purpose well, keeps ice water cold, and keeps coffee hot all day. Some appreciate the durability and style of thermo. That said, some complain about the cap not staying on tight.

"...(almost 8 months) and there is wear/tear from dropping but its perfectly functional." Read more

"Got the stome grey color on sale for like $22. It is perfect. Fits into my car cupholder and my backpack side pocket, both sticking points for me...." Read more

"It was a gift for my wife who always drinks hot water. Does the job well and she’s happy!" Read more

"I like hydroflask bottles. Ordered the white 21 oz and it’s perfect. Durable and attractive product." Read more

118 customers mention104 positive14 negative

Customers like the portability of thermos. They mention it's easy to carry around all day, durable, and handy for travel. Some appreciate the handle up top, strap, and flex cap. They also say it'll keep liquids cold all day and is great for air travel.

"...it every time I took a drink or poured from it.*Cup Holder friendly in my old Jeep*Nice color*Sturdy construction..." Read more

"...And the best part is that I walk everywhere hands free 🙌 no tumblers to carry around and no spilling water everywhere 🫶..." Read more

"...Ice water lasts for over two days! This is a must for plane travel as well as hiking." Read more

"...The flexible strap makes it easy to carry or attach to a backpack, providing a hands-free option during hikes or workouts...." Read more

142 customers mention84 positive58 negative

Customers are mixed about the value of thermos. Some mention it works well and is a good value, while others say it's overpriced, not worth it, and a useless chuck of metal.

"...Amazon had it and at a good price. This is very durable and we have not had any issues with leaking...." Read more

"Love the color so my vibe. My only issue with hydro flasks is how expensive they are and how bad the quality is...." Read more

"...Easy product to clean and maintain. Healthier and cheaper than plastic water bottles. The product has now paid for itself after 30+ days." Read more

"This bottle is amazing and $18 is a wonderful price, nothing to complain but a little scratch in the painting, which is small but it makes the..." Read more

I am both pleased and impressed!
5 Stars
I am both pleased and impressed!
It about wore me out looking at insulated bottles with so many out there to choose from!I am a heavy coffee drinker and wanted to be able to carry a nice, fresh refill for my travel mug while out and about.I will begin by saying that the first photo in my review, does NOT accurately represent the actual color that I purchased, Agave.The fluorescent lights in my shop are not color friendly. The actual color is a soft greyish green, like sage leaves and is very pleasant.Edit to ad: We had a spot of sunshine on the back porch today, so I took it out in the sunshine for a better pic. Much better color representation in the last picture.Initially, I was looking in the $20 range and found a lot of products that were "close" to what I wanted, but no cigar. After looking at the Hydro Flask page and seeing that accessories and replacement parts are available, I decided it would be worth a try. At the steeper price, over twice the price in many cases, it was worth it to get exactly what I wanted.My search criteria was as follows: * A Wide Mouth: For ease of filling, cleaning, easy pouring and nice big gulps. No straw or spout to clean or fiddle with. .*A Plastic Stopper: Because stainless on stainless threads are prone to galling.* No Big, Fragile or Obtrusive Handle: Didn't want something that would break off or get in the way or a lanyard to collect crud.This handle is small, folds back unobtrusively and is flexible so shouldn't break if twisted or bumped.*Easy to fill with hot liquids or cold beverages with ice.*A Centered Spout: So I didn't have to look and align it every time I took a drink or poured from it.*Cup Holder friendly in my old Jeep*Nice color*Sturdy constructionThis has absolutely ticked all of the boxes.It's slim enough to hold comfortably, very attractive without being showy and well constructed.I think we're going to be coffee drinking buddies for a very long time.
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Top reviews from the United States

Reviewed in the United States on February 5, 2024
Style: 24 OzColor: AgaveVerified Purchase
It about wore me out looking at insulated bottles with so many out there to choose from!

I am a heavy coffee drinker and wanted to be able to carry a nice, fresh refill for my travel mug while out and about.

I will begin by saying that the first photo in my review, does NOT accurately represent the actual color that I purchased, Agave.
The fluorescent lights in my shop are not color friendly. The actual color is a soft greyish green, like sage leaves and is very pleasant.

Edit to ad: We had a spot of sunshine on the back porch today, so I took it out in the sunshine for a better pic. Much better color representation in the last picture.

Initially, I was looking in the $20 range and found a lot of products that were "close" to what I wanted, but no cigar. After looking at the Hydro Flask page and seeing that accessories and replacement parts are available, I decided it would be worth a try. At the steeper price, over twice the price in many cases, it was worth it to get exactly what I wanted.

My search criteria was as follows:

* A Wide Mouth: For ease of filling, cleaning, easy pouring and nice big gulps. No straw or spout to clean or fiddle with. .

*A Plastic Stopper: Because stainless on stainless threads are prone to galling.

* No Big, Fragile or Obtrusive Handle: Didn't want something that would break off or get in the way or a lanyard to collect crud.
This handle is small, folds back unobtrusively and is flexible so shouldn't break if twisted or bumped.

*Easy to fill with hot liquids or cold beverages with ice.

*A Centered Spout: So I didn't have to look and align it every time I took a drink or poured from it.

*Cup Holder friendly in my old Jeep
*Nice color
*Sturdy construction

This has absolutely ticked all of the boxes.
It's slim enough to hold comfortably, very attractive without being showy and well constructed.

I think we're going to be coffee drinking buddies for a very long time.
Customer image
5.0 out of 5 stars I am both pleased and impressed!
Reviewed in the United States on February 5, 2024
It about wore me out looking at insulated bottles with so many out there to choose from!

I am a heavy coffee drinker and wanted to be able to carry a nice, fresh refill for my travel mug while out and about.

I will begin by saying that the first photo in my review, does NOT accurately represent the actual color that I purchased, Agave.
The fluorescent lights in my shop are not color friendly. The actual color is a soft greyish green, like sage leaves and is very pleasant.

Edit to ad: We had a spot of sunshine on the back porch today, so I took it out in the sunshine for a better pic. Much better color representation in the last picture.

Initially, I was looking in the $20 range and found a lot of products that were "close" to what I wanted, but no cigar. After looking at the Hydro Flask page and seeing that accessories and replacement parts are available, I decided it would be worth a try. At the steeper price, over twice the price in many cases, it was worth it to get exactly what I wanted.

My search criteria was as follows:

* A Wide Mouth: For ease of filling, cleaning, easy pouring and nice big gulps. No straw or spout to clean or fiddle with. .

*A Plastic Stopper: Because stainless on stainless threads are prone to galling.

* No Big, Fragile or Obtrusive Handle: Didn't want something that would break off or get in the way or a lanyard to collect crud.
This handle is small, folds back unobtrusively and is flexible so shouldn't break if twisted or bumped.

*Easy to fill with hot liquids or cold beverages with ice.

*A Centered Spout: So I didn't have to look and align it every time I took a drink or poured from it.

*Cup Holder friendly in my old Jeep
*Nice color
*Sturdy construction

This has absolutely ticked all of the boxes.
It's slim enough to hold comfortably, very attractive without being showy and well constructed.

I think we're going to be coffee drinking buddies for a very long time.
Images in this review
Customer image Customer image Customer image Customer image Customer image
Customer imageCustomer imageCustomer imageCustomer imageCustomer image
13 people found this helpful
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Reviewed in the United States on April 2, 2024
Style: 21 OzColor: LupineVerified Purchase
This bottle comes with a manufacturer’s lifetime warranty. I’m thrilled. I absolutely love the Hydro Flask Stainless Steel Standard Mouth Water Bottle! It comes in a beautiful color, and its double-wall vacuum insulation keeps my beverages at the perfect temperature for hours. Whether I’m enjoying a hot coffee on a chilly morning or sipping ice-cold water on a hot day, this bottle delivers every time.

One of its standout features is its reliability – it doesn’t leak, even when tossed into a bag or backpack. The flex cap ensures easy access while preventing spills. Plus, its sleek design adds a touch of style to my everyday routine.

The only minor downside is that if I add carbonated drinks, there’s a risk of a fizzy fountain when opening the bottle. However, I believe this is a common issue with many similar products, and it doesn’t diminish the overall quality and functionality of the Hydro Flask bottle. Overall, I highly recommend it to anyone looking for a durable, stylish, and reliable water bottle.
Customer image
5.0 out of 5 stars Stylish and Functional, lifetime warranty: Hydro Flask Stainless Steel Standard Mouth Water Bottle
Reviewed in the United States on April 2, 2024
This bottle comes with a manufacturer’s lifetime warranty. I’m thrilled. I absolutely love the Hydro Flask Stainless Steel Standard Mouth Water Bottle! It comes in a beautiful color, and its double-wall vacuum insulation keeps my beverages at the perfect temperature for hours. Whether I’m enjoying a hot coffee on a chilly morning or sipping ice-cold water on a hot day, this bottle delivers every time.

One of its standout features is its reliability – it doesn’t leak, even when tossed into a bag or backpack. The flex cap ensures easy access while preventing spills. Plus, its sleek design adds a touch of style to my everyday routine.

The only minor downside is that if I add carbonated drinks, there’s a risk of a fizzy fountain when opening the bottle. However, I believe this is a common issue with many similar products, and it doesn’t diminish the overall quality and functionality of the Hydro Flask bottle. Overall, I highly recommend it to anyone looking for a durable, stylish, and reliable water bottle.
Images in this review
Customer image
Customer image
Reviewed in the United States on April 18, 2024
Style: 21 OzColor: WhiteVerified Purchase
This bottle is amazing! This is my second HydroFlask, I have a larger 40 oz but it doesn’t fit in my backpack, so I decided to get the 21oz bottle because it not that heavy to carry it on my backpack all day along my laptop and other necessities. No spill at all, mind you, this bottle is inside my backpack with my laptop all day and never had an accident! And the best part is that I walk everywhere hands free 🙌 no tumblers to carry around and no spilling water everywhere 🫶
Customer image
5.0 out of 5 stars My daily companion 👍
Reviewed in the United States on April 18, 2024
This bottle is amazing! This is my second HydroFlask, I have a larger 40 oz but it doesn’t fit in my backpack, so I decided to get the 21oz bottle because it not that heavy to carry it on my backpack all day along my laptop and other necessities. No spill at all, mind you, this bottle is inside my backpack with my laptop all day and never had an accident! And the best part is that I walk everywhere hands free 🙌 no tumblers to carry around and no spilling water everywhere 🫶
Images in this review
Customer image
Customer image
Reviewed in the United States on April 26, 2024
Style: 24 OzColor: GojiVerified Purchase
This is my 6th Hydro flask! I have either beat them up or forgotten them places lol! I swear by them.... Price and all! I believe they are still a couple notches above any knockoff that you could find. You can find good knockoffs for sure but nothing keep the ice cold and the hot hot quite as well as a hydro flask!
Reviewed in the United States on April 13, 2024
Style: 21 OzColor: IndigoVerified Purchase
We’d gotten our daughter one of these for school awhile back and she liked it a lot. So, I got a lavender one to bring to work and I noticed on days my husband had pickleball, he was taking it because he liked the handle. So to prevent a collision of us needing it on the same day, I ordered him one. I also like the option of ordering the separate straw version of the caps , which my daughter preferred.
Reviewed in the United States on March 18, 2024
Style: 24 OzColor: IndigoVerified Purchase
Mantiene el frío e inclusive el hielo durante mucho tiempo.
Lo único que no me gusta mucho es que el exterior es de metal, y en días de sol la botella se pone muy muy caliente por fuera. Por dentro se sigue manteniendo helada.

Por lo demás es un excelente producto
Reviewed in the United States on April 15, 2024
Style: 18 OzColor: PacificVerified Purchase
Bought it for the gym, and I love this little guy. Love the color too (pacific I think?). I use it at the gym every other day, couldn't be happier. I bought the smallest size and I maybe should have bought one size up, but I kinda like how small it is. It carries exactly enough water for me at the gym and no more, plus its small enough that it never gets in the way much. Anyway, great water bottle!
Reviewed in the United States on April 26, 2024
Style: 24 OzColor: CascadeVerified Purchase
My family loves the hydro flask brand because they don’t leak or spill. They’re very durable. I love how they are to drink from, light-weight, beautiful colors, sweat proof, and so easy to clean. It’s easy to use and comfortable to carry in your bag or fit in your car cup holder.

Top reviews from other countries

Translate all reviews to English
Dany
5.0 out of 5 stars Excelente
Reviewed in Mexico on May 9, 2024
Style: 18 OzColor: IndigoVerified Purchase
De los mejores termos que eh comprado, llego bien
Julie Chae
5.0 out of 5 stars Quality guaranteed
Reviewed in Canada on April 30, 2024
This brabd never lets me down
Peter Howe
5.0 out of 5 stars Wow great product
Reviewed in Canada on April 26, 2024
Style: 24 OzColor: LupineVerified Purchase
Tried it last night, I always take a cold drink to bed. Works great, what was left was still cold, fantastic.
Dave
5.0 out of 5 stars Perfect size for travel
Reviewed in Canada on April 17, 2024
Style: 21 OzColor: AgaveVerified Purchase
Perfect size for the water bottle holder in my travel backpack. Very comfortable to drink out of due to the design of the edges around the lid. Perfect opening size for most ice cubes. Keeps drinks cold reasonably long. Haven't tried with hot drinks. Would prefer a stainless steel lid, but see that one is available separately.
Danilo
5.0 out of 5 stars Great product!
Reviewed in Canada on April 19, 2024
Style: 21 OzColor: IndigoVerified Purchase
It's not so cheap, but it's worth it.