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

4.7 out of 5 stars 23,869 ratings
$22.98
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Style: 18 Oz
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Purchase options and add-ons

Brand Hydro Flask
Capacity 18 Fluid Ounces
Color Black
Recommended Uses For Product Water
Special Feature Straw, dishwasher safe, double wall, leak-proof, insulated, leak-proof

About this item

  • Stainless steel
  • Imported
  • 24 hours cold, 12 hours hot
  • TempShield️ double-wall vacuum insulation
  • Leakproof when closed
  • Pure taste, no flavor transfer
  • Durable stainless steel
› See more product details

Competitively priced item

Amazon's Choice
4.3 out of 5 stars (3453)
$16.56

Frequently bought together

Hydro Flask Stainless Steel Standard Mouth Water Bottle with Flex Cap and Double-Wall Vacuum Insulation
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Hydro Flask Standard Mouth Lids- Accessory for Standard Mouth Water Bottle
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Top Brand: Hydro Flask

Highly Rated
100K+ customers rate items from this brand highly
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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

Product information

Technical Details

Brand ‎Hydro Flask
Capacity ‎18 Fluid Ounces
Color ‎Black
Recommended Uses For Product ‎Water
Special Feature ‎Straw, dishwasher safe, double wall, leak-proof, insulated, leak-proof
Age Range (Description) ‎Adult
Product Dimensions ‎2.85"W x 10.3"H
Model Name ‎21 oz Standard Mouth
Item Weight ‎11.3 Ounces
Theme ‎Adventure
Material ‎Stainless Steel
Number of Items ‎1
Pattern ‎Bottle
Included Components ‎bottle, lid
Product Care Instructions ‎Dishwasher safe
Base Diameter ‎2.85 Inches
Cap Type ‎Flex Cap
With Lid ‎Yes
Is Dishwasher Safe ‎Yes
UPC ‎810497025574
Manufacturer ‎Hydro Flask
Global Trade Identification Number ‎00810497025574
Item Package Dimensions L x W x H ‎9.29 x 3.23 x 3.19 inches
Package Weight ‎0.37 Kilograms
Item Dimensions LxWxH ‎2.85 x 2.85 x 10.3 inches
Brand Name ‎Hydro Flask
Warranty Description ‎LIFETIME
Suggested Users ‎mens
Part Number ‎S18SX001
Model Year ‎2020
Style ‎18 Oz
Size ‎18 Ounces
Sport Type ‎Exercise & Fitness

Additional Information

ASIN B01MS9D2VG
Customer Reviews
4.7 out of 5 stars 23,869 ratings

4.7 out of 5 stars
Best Sellers Rank #359 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
#22 in Insulated Bottles
#41 in Water Bottles
Date First Available March 31, 2013

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

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Customer reviews

4.7 out of 5 stars
23,869 global ratings

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Customers say

Customers find the water bottle keeps water cold all day and holds ice for up to 24 hours, while being well-made and durable even with falls and dents. The bottle fits perfectly in car cup holders and backpack pockets, with a bright white color and watertight seal. While customers appreciate its ease of transport and portability, they report that it gets dented in various places.

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804 customers mention "Water retention"709 positive95 negative

Customers praise the thermos's water retention capabilities, noting it keeps drinks cold all day and holds ice for up to 24 hours.

"Strong, easy to clean, cute! Fits cup holders and keeps water cold all day" Read more

"...Love the color and how it keeps the water cold after hours of adding ice...." Read more

"...The wide mouth design makes it easy to fill with ice or clean after a long day, and the sleek design fits perfectly in my gym bag or car cup holder...." Read more

"Haven't met a cupholder it hasn't fit in yet. Holds cold temp for a while. Easy to clean and not too heavy...." Read more

506 customers mention "Water bottle quality"506 positive0 negative

Customers love this water bottle.

"...Definitely a perfect replacement for your water bottles ( lost 2, and broke 1 ) and over other good brands this is so far my favorite...." Read more

"...Great hydro flask!" Read more

"...Like a solid product. Very beautiful, elegant, and practical. Great product!" Read more

"Great Bottle!" Read more

466 customers mention "Durability"369 positive97 negative

Customers find the thermos well-made and secure, with one customer noting it doesn't tip over easily.

"Strong, easy to clean, cute! Fits cup holders and keeps water cold all day" Read more

"...What really stands out to me is how durable it is; I’ve dropped it more times than I can count, and it barely has a scratch...." Read more

"...It is well made, keep liquid cool for hours and looks sharp." Read more

"...I really like the cap, very secure and tight. No issues with water leaking from the top. The double wall kept my water really cold...." Read more

278 customers mention "Size"245 positive33 negative

Customers like the thermos's size, as it fits well in cup holders, backpack pockets, and cars.

"Strong, easy to clean, cute! Fits cup holders and keeps water cold all day" Read more

"...It is easy to wash. I also take it with me to the gym and fits in every cup holder that the machines have for your bottle...." Read more

"...to fill with ice or clean after a long day, and the sleek design fits perfectly in my gym bag or car cup holder...." Read more

"...I just bought same but 21oz which is perfect size, fits nicely in my bag. It is well made, keep liquid cool for hours and looks sharp." Read more

234 customers mention "Looks"220 positive14 negative

Customers like the thermos's appearance, describing it as pretty and noting its good quality color, with one customer particularly appreciating the lantern design of the lid.

"Strong, easy to clean, cute! Fits cup holders and keeps water cold all day" Read more

"...It is well made, keep liquid cool for hours and looks sharp." Read more

"This is a beautiful water bottle that I love using. It keeps my hot drinks hot and cold drinks cold, so it's very functional...." Read more

"...I really like the cap, very secure and tight. No issues with water leaking from the top. The double wall kept my water really cold...." Read more

178 customers mention "Leak resistance"145 positive33 negative

Customers appreciate the thermos's leak resistance, noting its watertight seal that prevents spills.

"...Does not leak and I love the big opening...." Read more

"...Holds cold temp for a while. Easy to clean and not too heavy. Lid seals well and nice handle for toting around...." Read more

"...I really like the cap, very secure and tight. No issues with water leaking from the top. The double wall kept my water really cold...." Read more

"...Once the lid is attached, you will have a watertight seal...." Read more

163 customers mention "Ease of transport"149 positive14 negative

Customers find the thermos easy to transport, appreciating that it's not too heavy or large and can fit in work bags and purses, making it perfect for traveling.

"Easy to carry everywhere ( work, home, gym, on the go ). Love the color and how it keeps the water cold after hours of adding ice...." Read more

"...Lid seals well and nice handle for toting around. Lighter than my old stainless steel bottle which is a plus. Goes with me everywhere, everyday." Read more

"...Was perfect for traveling, hiking, and visiting national parks. It's a good size that fits in cup holders and backpacks, but not too small...." Read more

"...The container kept our water cold all day. No leaks, and easy to carry." Read more

181 customers mention "Dents"49 positive132 negative

Customers report that the thermos develops slight dents in the body and shows signs of scratching, with one customer noting that the red color version is particularly susceptible to damage.

"...My only complain is after using it for a while, it gets dented in various places, more so than my Swell water bottle...." Read more

"...However, on the third day, it fell on the marble counter and dented easily. This is surprising for a bottle advertised as durable steel...." Read more

"...it is; I’ve dropped it more times than I can count, and it barely has a scratch...." Read more

"...I will say, after one bike ride, some of the coating got permanently scuffed and partially scratched off just from sitting in a basket in front of..." Read more

Favorite water bottle.
5 out of 5 stars
Favorite water bottle.
Easy to carry everywhere ( work, home, gym, on the go ). Love the color and how it keeps the water cold after hours of adding ice. I can’t drink water that is room temperature, even in the cold I have to add ice. Does not leak and I love the big opening. I’m not a fan of water bottles with straws or sip straws or other openings where barely any water comes out or you have to suck on it for the water to come out. I think this opening helps me drink a lot more water. And I like to refill it more than my 32oz, but it has been helping me a lot with my water intake. It is easy to wash. I also take it with me to the gym and fits in every cup holder that the machines have for your bottle. With my 32oz I have gotten some of them stuck in the cup holder or with 64oz I have to leave it right next to the machine. But with this one it is easy to take a quick sip or long sip. It is easy to open and close. I just bought another one in the other shade of purple because I am obsessed with it. Definitely a perfect replacement for your water bottles ( lost 2, and broke 1 ) and over other good brands this is so far my favorite. Highly recommend it, worth the price!
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Top reviews from the United States

  • Megan Walsh
    5.0 out of 5 stars Favorite bottle
    Reviewed in the United States on April 6, 2025
    Style: 21 OzColor: Fir GreenVerified Purchase
    Strong, easy to clean, cute! Fits cup holders and keeps water cold all day
    2 people found this helpful
    Helpful
     Report
  • Maria
    5.0 out of 5 stars Favorite water bottle.
    Reviewed in the United States on November 29, 2024
    Style: 21 OzColor: Lupine PurpleVerified Purchase
    Easy to carry everywhere ( work, home, gym, on the go ). Love the color and how it keeps the water cold after hours of adding ice. I can’t drink water that is room temperature, even in the cold I have to add ice. Does not leak and I love the big opening. I’m not a fan of water bottles with straws or sip straws or other openings where barely any water comes out or you have to suck on it for the water to come out. I think this opening helps me drink a lot more water. And I like to refill it more than my 32oz, but it has been helping me a lot with my water intake. It is easy to wash. I also take it with me to the gym and fits in every cup holder that the machines have for your bottle. With my 32oz I have gotten some of them stuck in the cup holder or with 64oz I have to leave it right next to the machine. But with this one it is easy to take a quick sip or long sip. It is easy to open and close. I just bought another one in the other shade of purple because I am obsessed with it. Definitely a perfect replacement for your water bottles ( lost 2, and broke 1 ) and over other good brands this is so far my favorite. Highly recommend it, worth the price!
    Customer image
    Maria
    5.0 out of 5 stars
    Favorite water bottle.

    Reviewed in the United States on November 29, 2024
    Easy to carry everywhere ( work, home, gym, on the go ). Love the color and how it keeps the water cold after hours of adding ice. I can’t drink water that is room temperature, even in the cold I have to add ice. Does not leak and I love the big opening. I’m not a fan of water bottles with straws or sip straws or other openings where barely any water comes out or you have to suck on it for the water to come out. I think this opening helps me drink a lot more water. And I like to refill it more than my 32oz, but it has been helping me a lot with my water intake. It is easy to wash. I also take it with me to the gym and fits in every cup holder that the machines have for your bottle. With my 32oz I have gotten some of them stuck in the cup holder or with 64oz I have to leave it right next to the machine. But with this one it is easy to take a quick sip or long sip. It is easy to open and close. I just bought another one in the other shade of purple because I am obsessed with it. Definitely a perfect replacement for your water bottles ( lost 2, and broke 1 ) and over other good brands this is so far my favorite. Highly recommend it, worth the price!
    Images in this review
    Customer image
    7 people found this helpful
    Helpful
     Report
  • Cat
    5.0 out of 5 stars Perfect water bottle baby
    Reviewed in the United States on March 22, 2025
    Style: 24 OzColor: ReefVerified Purchase
    Haven't met a cupholder it hasn't fit in yet. Holds cold temp for a while. Easy to clean and not too heavy. Lid seals well and nice handle for toting around. Lighter than my old stainless steel bottle which is a plus. Goes with me everywhere, everyday.
    One person found this helpful
    Helpful
     Report
  • Skylar Santacroce
    5.0 out of 5 stars Better than most bottles
    Reviewed in the United States on November 20, 2024
    Style: 24 OzColor: Stone GrayVerified Purchase
    As someone who’s always on the go, my Hydro Flask has become an essential part of my daily routine. The insulation is no joke—it keeps my water ice-cold during long training sessions and my coffee piping hot when I’m heading to early morning workouts. What really stands out to me is how durable it is; I’ve dropped it more times than I can count, and it barely has a scratch.

    The wide mouth design makes it easy to fill with ice or clean after a long day, and the sleek design fits perfectly in my gym bag or car cup holder. I also love how it doesn’t sweat, no matter how cold the contents are, which is a huge plus when you’re carrying it around all day.

    For athletes, travelers, or anyone who values convenience and performance, the Hydro Flask is worth every penny. It’s not just a water bottle—it’s an investment in staying hydrated and fueled no matter where life takes you
    13 people found this helpful
    Helpful
     Report
  • Josh rose
    5.0 out of 5 stars Functional, dependable and looks great
    Reviewed in the United States on January 30, 2025
    Style: 21 OzColor: Indigo BlueVerified Purchase
    I had a 24oz bottle that was great but a little too tall for my work bag. I just bought same but 21oz which is perfect size, fits nicely in my bag. It is well made, keep liquid cool for hours and looks sharp.
    2 people found this helpful
    Helpful
     Report
  • Oscar Cat
    4.0 out of 5 stars Beautiful, Keeps Drinks Warm/Cold, Dents
    Reviewed in the United States on March 18, 2025
    Style: 21 OzColor: WhiteVerified Purchase
    This is a beautiful water bottle that I love using. It keeps my hot drinks hot and cold drinks cold, so it's very functional. The handle is convenient. My only complain is after using it for a while, it gets dented in various places, more so than my Swell water bottle. It still works well, just not as pretty as original.
    Helpful
     Report
  • Haley
    5.0 out of 5 stars Keeps Drinks Cool, Great for Hiking & Traveling
    Reviewed in the United States on August 25, 2024
    Style: 18 OzColor: BlackVerified Purchase
    I recently bought this for a trip to the Dakotas and love it! Was perfect for traveling, hiking, and visiting national parks. It's a good size that fits in cup holders and backpacks, but not too small. I really like the cap, very secure and tight. No issues with water leaking from the top. The double wall kept my water really cold. My Yeti cup works slightly better for keeping ice from melting, but this is more cost effective and has the better lid for sealing in the drink. Great hydro flask!
    11 people found this helpful
    Helpful
     Report
  • Y2K Blackout
    5.0 out of 5 stars The Inspiration of Insulation!
    Reviewed in the United States on November 30, 2024
    Style: 24 OzColor: Indigo BlueVerified Purchase
    This is not the only vacuum flask you can buy that will keep your beverages hot or cold. Hydro Flask is one of those better knows brands that charges a premium for its products. At the end of the day, it works. I have been using it for months. If you add ice and water and screw on the lid, you can expect your water will still be cold more than 24 hours later!

    Unless you're just using it for water, you might find it difficult to clean. I expect that this product will dent if you drop it. Luckily, mine is still in mint condition.

    Once the lid is attached, you will have a watertight seal. You also have a handy way to hold it; the lantern design of the lid is a nice touch!

    I love my Hydro Flask and expect it to last for years to come!
    One person found this helpful
    Helpful
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Top reviews from other countries

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  • SILVIA GIACOMELLI
    5.0 out of 5 stars Hydro flask - 532 ml -
    Reviewed in Italy on June 5, 2023
    Verified Purchase
    Bella boraccia , bel colore ananas 🍍....
    Customer image
    SILVIA GIACOMELLI
    5.0 out of 5 stars
    Hydro flask - 532 ml -

    Reviewed in Italy on June 5, 2023
    Bella boraccia , bel colore ananas 🍍....
    Images in this review
    Customer image
    Report
  • Walter Alves Passos Filho
    5.0 out of 5 stars Produto excelente qualidade.
    Reviewed in Brazil on August 24, 2024
    Style: 18 OzColor: WhiteVerified Purchase
    Mantém o líquido em baixa temperatura.
    Report
  • Ernesto
    5.0 out of 5 stars Acabado impecable y materiales muy buenos
    Reviewed in Spain on June 30, 2023
    Style: 21 OzColor: WhiteVerified Purchase
    -Botella Hydro Flask con boca estándar de 621 ml (21 oz) color blanco-
    Los materiales tienen muy buen acabado. El interior está fabricado en acero inoxidable y el exterior tiene un acabado mate. No presentan ningún rasguño o defecto. La botella no tiene componentes químicos y está libre de bisfenol A (BPA).
    Tiene unas propiedades aislantes excepcionales, gran durabilidad y gracias al tapón incluido no tiene fugas, la botella no gotea aunque se ponga boca abajo.
    Sin duda, es una botella muy recomendable para su uso tanto en exteriores como en interiores, con buen acabado y materiales.
    Se recomienda su compra.
    Customer image
    Ernesto
    5.0 out of 5 stars
    Acabado impecable y materiales muy buenos

    Reviewed in Spain on June 30, 2023
    -Botella Hydro Flask con boca estándar de 621 ml (21 oz) color blanco-
    Los materiales tienen muy buen acabado. El interior está fabricado en acero inoxidable y el exterior tiene un acabado mate. No presentan ningún rasguño o defecto. La botella no tiene componentes químicos y está libre de bisfenol A (BPA).
    Tiene unas propiedades aislantes excepcionales, gran durabilidad y gracias al tapón incluido no tiene fugas, la botella no gotea aunque se ponga boca abajo.
    Sin duda, es una botella muy recomendable para su uso tanto en exteriores como en interiores, con buen acabado y materiales.
    Se recomienda su compra.
    Images in this review
    Customer imageCustomer imageCustomer image
    Report
  • Kevin Morales
    5.0 out of 5 stars Excelente termo con sus 3 tecnologías,
    Reviewed in Mexico on February 3, 2025
    Style: 21 OzColor: Indigo BlueVerified Purchase
    Excelente marca, puedes hacerle grabado láser
    Report
  • JOAN A.
    5.0 out of 5 stars Cara pero vale la pena
    Reviewed in Spain on November 13, 2024
    Style: 24 OzColor: Goji RedVerified Purchase
    Llevo más de 1 año con ella y ninguna queja. He tenido muchas y ninguna como está. En breve compraré otra para mi pareja
    Report