Hydro Flask

Hydro Flask Standard Flex Cap

$28.99

997+ bought in the past month

About this item

  • IDEAL DRINKING TEMPERATURE: Our double-wall vacuum-insulated bottle keeps beverages cold for up to 24 hours and hot for up to 12 hours. The TempShield technology prevents condensation and heat transfer to the outside.
  • BETTER DRINKING ON THE GO: With double-wall, vacuum-insulated technology, our water bottle maintains the IDEAL temperature. The leak-proof Flex Straw Lid allows for easy drinking with just one hand.
  • DURABLE WATER BOTTLE: Our eco-friendly, sturdy stainless steel bottle is perfect for any type of sport. The durable construction withstands everything life throws at it, while keeping the taste of your drink intact.
  • DISHWASHER SAFE: Our water bottles come with a powder coating that makes cleaning a breeze. Enjoy more leisure time and less work with this convenient feature.
  • SATISFACTION GUARANTEED: We offer a lif etime warranty against manufacturer defects. HYDRO FLASK stands behind our durable and robust materials and is committed to high standards.
$28.99

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Product details
BrandHydro Flask
Capacity1.3 Pounds
ColorFossil
Recommended Uses For ProductWater
Special FeatureCold 24 Hours, Hot 12 Hours
Technical specifications
brandHydro Flask
capacity1.3 Pounds
colorFossil
recommended_uses_for_productWater
special_featureCold 24 Hours, Hot 12 Hours
age_range_descriptionAdult
product_dimensions5.91"W x 9.84"H
model_nameS21FS162
item_weight0.41 Kilograms
materialStainless Steel
number_of_items2
patternFossil
included_components1x 21 OZ STANDARD FLEX STRAW CAP FOSSIL
product_care_instructionsHand Wash Only
with_lidYes
is_dishwasher_safeYes
upc810096856869
manufacturerHelen of Troy
item_package_dimensions_l_x_w_x_h10.59 x 3.23 x 3.19 inches
package_weight0.42 Kilograms
item_dimensions_lxwxh5.91 x 5.91 x 9.84 inches
brand_nameHydro Flask
part_numberS21FS162
styleStraw Cap
size21 Ounces
best_sellers_rank#121,077 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #1,086 in Insulated Bottles #2,158 in Water Bottles #66,777 in Dining & Entertaining
date_first_availableMay 10, 2024

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Customer reviews

4.71,342 ratings
  1. 588%
  2. 413%
  3. 30%
  4. 20%
  5. 10%

Customers say

Customers find the thermos keeps beverages cold all day and appreciate its durability, though some report caps breaking within two days. Customers consider it worth the money and praise its leak-proof design.

★★★★★

Very pleased with this Hydro Flax

T LaRueNovember 3, 2025

A lovely and sturdy flask. The 21-ounce size is ideal for travel and for taking to meetings, and fits nicely into my treadmill's cup-holder. Keeps water cold and refreshing. The flex cap is markedly easier to drink with than a regular straw. Read more

★★★★★

Quality

SunflowerSeptember 18, 2025

Last Christmas. We bought quite a few of these for my daughter. She really likes these. It keeps your fluids cold all day. The first one she ever had lasted her for years. It was just time for some new ones they could be costly but we also buy the cheaper one and it’s fine. Read more

★★★★★

Amazing!

kayta willhoitMarch 10, 2025

I own many hydroflask products and I must say, this is my favorite color and size right now. Not super heavy, my ice lasts for days! Read more

★★★★★

Love it!

BryanApril 15, 2024

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! Read more

★★★★★

High Quality Leak Proof Bottle

Giovanni RossiDecember 29, 2022

When you buy a Hydro Flask you are buying the name. Yes, there are other bottles out there that do the same thing for a fraction of the price but just like any other item out there, the brand is what you buy. With that being said, I purchased the Hydro Flask for my daughter and she loves it. The quality of it is top-notch. It's super easy to clean and can be thrown in the dishwasher. It has a protective coating on it so it won't damage the colors of your bottle. If you're not really the brand type of person, definitely look at cheaper options but the Hydro Flask has been a nice item to have. Read more

★★★★☆

Bottle leaks!!!!!

Gloria MSeptember 1, 2021

I really like the color (blue) & was so excited to use it. I bought it to use at work. Unfortunately, it leaks a lot. The minute it lays on its side , it’ll leak. Also, my error, I purchased an 18 ounce bottle, too small. I recommend at least 22-24 ounce. The ice melts after 2 hours. However, it does keep water cold for the 2-3 hours I’m at work. Easy to handle, easy to clean. Read more

★★★★★

just as good as the one i got years ago that is still in perfect shape

LizardhavenApril 24, 2017

when i do research on a product i need, i try to have the work cover the issue for the rest of my life. so i got three different kinds of bottles in different colors and sizes i had got a large hydro flask when they first came out and was delighted with it not leaking and keeping things cold or hot for a long time. i think that many products are offered now that are similar but customer feedback shows many of them do leak or the color chips off. i went to the Customer feedback where all gave 5 stars and claimed no leaking or chipping. this hydro flask is the same quality as the one i got before, and i think the cap with the loop is a better design than the cap attached by a strap the first one i got has. while the wide lip is easy to fill without a funnel , it is slightly too wide to plan to drink directly out of, though i do it anyway i travel a 100 miles each way once a week and the bottles are saving me money by taking along drinks made at home. it helps and me to keep to my diet plan by making my own favorite teas or coffee with real cream, etc, instead of buying and drinking what is available even if it has ingredients i am trying to avoid. if you get something for travel i suggest you measure your cup holders so you get one that fits-this is a bit large for the drink holders in my car, but it does keep the coffee hot enough even though i drink it over several times during the day. Read more

★★★★★

Cute color

C BApril 11, 2025

Love this color, comes just as pictured. Great size and the handle is perfect for transport. Read more

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