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Hydro Flask

Hydro Flask Stainless Steel Vacuum Insulated Sports Water Bottle with Cap, Black, 21 Ounce

  • Based on 1,783 reviews
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Availability: In Stock.
Fulfilled by Amazon
Arrives Wednesday, Jul 30
Order within 18 hours and 59 minutes
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Size: 21 oz (621 ml) Standard Mouth


Color: Black


Features

  • Newly produced Hydro Flasks do not feature a registered trademark symbol next to the logo
  • Keeps beverages cold up to 24 hours and hot up to 12 hours when using the lid
  • BPA-free and phthalate-free; 18/8 food-grade stainless steel
  • Comes with a Sport Cap to help reduce spills; lid not leakproof
  • Lifetime warranty

Description

Size:21 oz (621 ml) Standard Mouth | Color:Black Hydration on the go. The 21 oz vacuum insulated Hydro Flask is our most versatile medium-sized water bottle and one of our most popular. It is the perfect go-anywhere companion on your busiest days. It fits nearly any size ice cube and is easy to drink from on the go. With a convenient 21 oz capacity and a moderately wide mouth opening, it's great for sports drinks, juice, smoothies or water. It stashes easily in a small shoulder bag, your pack’s side pocket or your car cup holder, and holds enough to keep you going for hours without weighing you down. This flask is as diverse as you!The 21 oz insulated Hydro Flask is made from 18/8 food-grade stainless steel, and the double wall vacuum insulation provides top notch insulation power, keeping cold liquids icy cold for up to 24 hours and hot liquids steaming hot for up to 6 hours.Hydro Flask is proud that all our products are BPA-free, recyclable and backed by a lifetime warranty. Look for the H-guy and Hydro Flask logo to ensure you’re getting the market’s premium insulating beverage bottle.Features:Easy to transportVersatile, middle-of-the-road sizeStandard Mouth OpeningTempShield(TM) Protected Double Wall Vacuum InsulatedKeeps Hot up to 6 Hours, Keeps Cold up to 24 HoursDurable, sweat-free powder coat finish (except for the Stainless option)BPA-Free18/8 Stainless SteelLifetime Warrantycompatible Lids: Hydro Flask Sport CapParks for All - With Hydro Flask's new giving program, Parks for All, they are focusing on one overarching goal: supporting the development and maintenance of public green spaces everywhereHand wash only with hot, soapy water. Rinse and dry, and it's ready for adventure


Product Dimensions: 2.87 x 2.87 x 9.4 inches


Item Weight: 10.4 ounces


Department: Mens


Manufacturer: HYDRO FLASK


Item model number: S21ST001


Is Discontinued By Manufacturer: No


Date First Available: June 10, 2016


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Jul 30

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • I had super high hopes for this Hydro Flask water bottle and ...
Color: Black Size: 21 Ounce
I purchased this water bottle for my very active son who is on 2 travel basketball and two travel soccer teams. I had super high hopes for this Hydro Flask water bottle and was happy to see how excited my son was when he received it. While the water stays cold, the water does not stay in the bottle...because it LEAKS!!! My son's uniforms and gear have been drenched on several occasions due to the leaky top, the same has happened in the car on the floor and the seats. My daughter has a larger Hydro Flask with the standard top and has not had any issues. I am so disappointed this time around and hope this faulty product issue can and will be rectified. ... show more
Reviewed in the United States on March 8, 2018 by D. Roberts-Mark
    • You'll never need another water bottle again
Color: Black Size: 21 Ounce
Seriously - the search is over. I like my water really cold, so I usually end up packing a ton of ice in the bottle - I don't need to with this one, because any ice I add will STILL be there 24+hrs later and that's no exaggeration. I find myself drinking a lot more water now that it's at my preferred temperature all the time. I also love that it doesn't sweat or get any condensation on it at all, no matter what environment it's in. It's a little more than I'd like to spend for a water bottle, but it's worth every penny for the quality. As an added bonus, it's basically indestructible. I'm incredibly clumsy and sometimes careless with my things - it's been dropped pretty hard on everything from concrete to asphalt and barely shows any scratches. Also makes a great eco-friendly gift! ... show more
Reviewed in the United States on December 26, 2018 by Victoria
    • Won’t retain ice.
Color: Black Size: 21 Ounce
I have owned and loved multiple Hydro Flasks over the past 10+ years. However, the black hydro flask with sport mouth I recently purchased from Amazon is a severe disappointment. My older hydro flasks would keep ice for more than 24 hours despite outside conditions. The new hydro flask won’t retain ice for 6 hours. I am going to try it with the regular cap instead of the sports cap to see if that makes a difference. Will report back. I tried the new Hydro Flask with a regular cap and the results were not appreciably different. So sad to see this once great American made product go down hill! ... show more
Reviewed in the United States on May 17, 2019 by John M Johnson
    • Perfection!
Color: Black Size: 21 Ounce
I rarely give out 5 Star reviews but this container is perfect for my needs. I use it primarily for short bike rides as I live in FL and was in need of a product that would keep my water / ice cold during my daily bike rides. Trust me, this is perfect for keeping liquids very cold for long periods of time. I will add that I am not one who will measure if it keep ice for days on end as this was not why I purchased the product. Also, for my purposes, the hydro flask fits snugly in the Topeak Cage 2 cage and is easily assessable. The spout is perfect as I have experienced zero issues drinking while riding. Some have reported leakage but I've yet to witness any to date but please note the website indicates this product is not waterproofed as there is a tiny hole on the sports cap which allows for flow while drinking. I will also add that the opening is large enough for medium ice cubes so again, it meets my goals. Finally, the quality is unmatched as I've been using this for well over a month and there is no degradation of quality to include the paint. Again, awesome product; it is as advertised. Hope this helps! ... show more
Reviewed in the United States on June 27, 2021 by TJORD
    • Kicked a diet soda addiction... worth every penny!
Color: Black Size: 21 Ounce
Review Image by Mark V. Deluca
I bought this product to help me kick a nasty diet soda addiction (I'm an 80's kid and was embalming myself with Aspartame). I can honestly say it was worth every penny. I've used other products (Kleen Kanteen, SIGG, etc) in the past, but those products sweat and left a mess on my desk at work and on me at the gym, warmed my water, and - in the case of Kleen Kanteen - looked unsightly as the paint peeled from the container. The Hydro Flask has allowed me to keep water cold at work and doesn't sweat, allowing me to drink cold and refreshing water all day at the office. It is also great at the gym for the same reasons. And it looks great! The matte finish feels good and the sports cap provides a nice seal. It is pricey, but I haven't bought a diet soda at work in over a month and a half (I was spending at least $1.75 per day on a 20oz bottle) so it has already paid for itself! I would highly recommend this product. ... show more
Reviewed in the United States on October 4, 2018 by Mark V. Deluca
    • Scam?
Color: Black Size: 21 Ounce
Not sure if I got a faulty product or what, but it did not keep absolutely anything cool. I'd place a bunch of ice there with water out in room temp with everything sealed, a few hours later, everything melted and water barely cold. Kinda sad.
Reviewed in the United States on August 15, 2018 by tea710
    • Great for Travel
Color: Black Size: 21 Ounce
This fits perfectly into my Nomatic Backpack. I travel 15 days a month for work and always have it with me. Been dropped many times, and while it does dent a bit when hitting concrete, that's expected. Keeps the water or iced tea COLD for hours, which is perfect for a cross country flight.
Reviewed in the United States on June 26, 2019 by MJ
    • The Best Water Bottle - You're Gonna Love It!
Color: Black Size: 21 Ounce
Yep. This is the one to get. Ordered it for my daughter (per her request). She has lots of water bottles but assures me this is the very best!!! All it's supposed to be and more. Gotta admit, it DOES look great: well made, easy to carry with you, and keeps water cold for quite awhile. When I asked if I should write a review, she insisted that I do. And told me to emphasize to anyone trying to decide which water bottle to get - you'll love this one. What else is there to say? ... show more
Reviewed in the United States on August 20, 2017 by Reviewer U Can Trust

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