Hydro Flask Standard Flex Cap Black 21 Oz
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Hydro Flask Standard Flex Cap Black 21 Oz

4.7/5
Product ID: 40929274
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Details

  • Brand
    Hydro Flask
  • Capacity
    21 Fluid
  • Color
    Black
  • Recommended Uses For Product
    Water
  • Special Feature
    Cold 24 Hours
🔒Leakproof seal
🔥12H hot retention
❄️24H cold retention

Description

💧 Stay cool, stay hot, stay unstoppable.

  • PURE TASTE EVERY TIME - Pro-grade stainless steel ensures no flavor transfer—hydrate with confidence.
  • BUILT TO LAST A LIFETIME - Durable, dishwasher safe, and backed by a lifetime warranty for the ultimate investment in hydration.
  • FITS YOUR FAST PACED LIFE - Cupholder-friendly design slides seamlessly into your daily commute or workout gear.
  • SIP IN STYLE ALL DAY LONG - Keeps drinks icy cold for 24 hours and steaming hot for 12 with advanced TempShield insulation.
  • ZERO SPILLS MAXIMUM HUSTLE - Leakproof Flex Cap means no mess, no stress—toss it in your bag and go.

The Hydro Flask Standard Flex Cap Black 21 Oz is a premium stainless steel insulated water bottle designed for professionals on the move. It features double-wall TempShield insulation that keeps beverages cold for 24 hours and hot for 12, a leakproof Flex Cap for worry-free transport, and a sleek cupholder-friendly design. Dishwasher safe and built with durable pro-grade steel, it guarantees pure taste without flavor transfer and comes with a lifetime warranty—perfect for millennial managers who demand style, function, and reliability.

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Specifications

BrandHydro Flask
Capacity21 Fluid Ounces
ColorBlack
Recommended Uses For ProductWater
Special FeatureCold 24 Hours, Leakproof, Dishwasher Safe
Age Range (Description)Adult
Product Dimensions1.12"W x 4.37"H
Model Name21 OZ STANDARD FLEX CAP
Item Weight23.68 g
ThemeSport
MaterialSTEEL
Number of Items1
PatternSolid
Included Componentsbottle, lid
Product Care InstructionsHand Wash Only
Base Diameter7.1 Centimeters
Cap TypeFlex Cap
With LidYes
Is Dishwasher SafeYes
Is MicrowaveableNo
Is Oven SafeNo
UPC810497025680
ManufacturerHydro Flask
Global Trade Identification Number00810497025680
Item Package Dimensions L x W x H10.08 x 3.23 x 3.19 inches
Package Weight0.4 Kilograms
Item Dimensions LxWxH1.12 x 1.12 x 4.37 inches
Brand NameHydro Flask
Warranty DescriptionLIFETIME
Suggested Usersgirls
Part NumberS21SX001
Model Year2020
Style21 Oz
Size21 Ounces
Sport TypeTrack & Field

Have a Question? See What Others Asked

Re Hydro Flask 24", what does "flex lid" mean?
Ok so does it come with little stickers?
Curious... is the bottle supposed to be perfectly round all the way up and down? i just received mine from amazon and it is not. it feels oblong.
I just bought this hydroflask in the color olive. Is it normal for the lid to have to be forced to close all the way? It doesnt close easily

Reviews

4.7

All from verified purchases

N**N

Really nice

Really nice

C**

True to description

Love this bottle, it’s leak proof and value for your money

P**T

Great Flask

I've had many water bottles and flasks in the past, and I thought I would give this one a try since I've heard only good things from the brand. I got the 21oz size with a screw on top and I thinks it's a great size for short travels and such. If I were going on a hike or taking a longer trip, I would recommended getting a larger size. I really like the mouth, it's the perfect size and is comfortable to drink out of. It seems leak proof and it keeps your liquids cold for a while. I tested it since it claimed to keep things cold for 12 hours. I poured ice and water into it and left it sitting at my desk for 12 hours. It wasn't as cold as when I first filled it and all of the ice was melted after that long, but it still was a decently refreshing cold drink. I'm not sure how well it would do if left in a hot car, or left out in the summer but it would still keep things pretty cold for a handful of hours I'm sure. It gets a thumbs up from me. :)

R**N

Exactly what I ordered

Exactly what I ordered and in perfect condition.

C**C

My Husband Stole My Son's Water Bottle

My son absolutely loves his water bottle. So does my husband. I think I need to buy another soon. 😂 It keeps ice water cold for well over 12 hours. It's easy to clean, takes a beating, and easy to carry because of the handle. I don't think we're going to go to any other brand. We have coffee cups too. The customer service is fast and professional.

E**E

Nice and Fair Competitor to Yeti

I'm definitely a Yeti fan, but this bottle from Hydro Flask does give Yeti some competition. The dings would be I think it might actually get dinged if you drop it...it's not as durable as other reviewers have said. But lightweight is a nice trade off (Yetis can be on the heavy side). The plastic top is nice and it doesn't leak or sweat. The only thing I notice is you kind of have to learn how to properly drink out of it without spilling it on your clothes. Once you figure out that, you are fine. I would definitely buy it again and in different colors. It's a nice product overall.

J**F

Great Thermos

I own 4 of these and love them. One for the gym one for home and 2 for the go! Keeps liquid cold for a long time!!

R**E

These are excellent!

.

Common Questions

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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€ 42.70

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anita G.

Good experience, but the tracking updates could be better.

2 months ago

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

Hydro Flask Standard Flex Cap Black 21 Oz | Desertcart Ireland