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Hydro Flask - Stainless Steel Water Bottle Vacuum Insulated Standard Mouth Black - 21 oz.
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Hydro Flask - Stainless Steel Water Bottle Vacuum Insulated Standard Mouth Black - 21 oz.

Middle-of-the-road size
Item #: 133906
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Hydro Flask - Stainless Steel Water Bottle Vacuum Insulated Standard Mouth Black - 21 oz.

  • Item# :133906
    UPC# :725100200029
  • Brand:Hydro Flask
  • Size/Form:21  oz.
  • Ship Weight:0.65

Hydro Flask - Stainless Steel Water Bottle Vacuum Insulated Standard Mouth Black - 21 oz. (621 ml)

Hydro Flask Stainless Steel Water Bottle Vacuum Insulated Standard Mouth Black is the perfect go-anywhere companion on your busiest days. 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. The Standard Mouth fits all shapes and sizes of ice cubes, yet is still small enough to drink from on-the-go, stuff in a pack, or nestle in a car cup holder. TempShield provides double wall insulation to protect temperature up to 24 hours cold and 6 hours hot.

Stainless Steel Water Bottle Vacuum Insulated Standard Mouth Black Features:

  • Easy to transport
  • Versatile, middle-of-the-road size
  • Perfect go-anywhere companion and will keep you going for hours
  • TempShield Protected - 24 hours cold and 6 hours hot
  • Durable, sweat-free powder coat finish
  • 18/8 Pro Grade Stainless Steel
  • BPA and phthalate free


They believe it is the unique combination of temperature, taste, and transport that make a Hydro Flask more than just a water bottle, and allows them to deliver what no one else can - unexpected refreshment each and every time.

Colder. Hotter. Longer. Happier.
Used in every product they make, TempShield is their double wall, vacuum insulated technology that guards the temperature of your drink. Bring ice water with you in the morning, and they promise you'll still have ice in the afternoon. Hectic morning getting in the way of your coffee sipping? No problem. They'll keep it hot until you're ready. They also guarantee no condensation or heat transfer to the outside of the bottle, ever. TempShield double wall insulation protects temperature from outside elements. Cold stays icy cold up to 24 hours. Hot stays steaming hot up to 6 hours. No Sweat.

Pure and refreshing. Every time.
All of their products are made with 18/8 pro-grade stainless steel - a metal recognized for its strength and purity. It also protects against flavor transfer, so today's IPA won't taste like yesterday's margarita. Sip and enjoy.

Unique powder coat.
Along with their TempShield technology allowing for the lightest weight and slimmest profile insulated bottle, their signature powder coat adds slip-free grip and extra durability - so you can take your Hydro Flask anywhere, on any adventure.

Meet the Flex Cap

The Hydro Flask Flex Cap is a completely new way to cap off your favorite beverage, and is the ideal combination of strength and flexibility. Designed for ultimate portability, they crafted every detail with easy-carry comfort in mind, and used materials that insulate and are built to last - so you can go further, for longer, keeping your favorite beverage comfortably by your side.

Soft Flexible Strap
Crafted to be comfortable…Flexible, durable TPU material, and a new wide handle design mean you can easily carry your favorite beverage with you all day long.

Innovative Honeycomb Technology
Based on the sweet geometry of nature, their new Honeycomb Insulation uses the same construction as a beehive, keeping internal temperatures protected. Translation: drinks stay icy cold or piping hot longer than ever before.

Stainless Steel Pivots
The Flex Cap's durable stainless steel pivots allow the strap to move when you do, which makes for easy, fluid motion and pure carrying joy. The careful construction also eliminates stress points, so strap breakage is a thing of the past.

About Hydro Flask

They'll keep water icy cold on a hot sunny beach. And serve up a hot coffee on the chairlift ride. They'll sit patiently by your camp chair with frosty cold beer while you gather wood for the fire. Or keep you hydrated on a hike: ice, water, go. And five hours later, after driving to the trailhead and climbing 2,000 feet, you'll still have ice and water while you enjoy the view. They'll bring you hot tea on misty riverside mornings when the steelhead are running, hot cocoa to coax your kids along a snowy trail, and a refreshing sip of "all-about-you" during Saturday afternoon yoga. They're not just along for the ride. They're along to help make the ride awesome.

Their Company
They are fortunate to call Bend, Oregon home, where there is desert to the east of town and mountains to the west. Their geography says a lot about who they are.

It's not uncommon for them to meet before work, hike the Cone (one of their many backcountry ski spots) and enjoy hot coffee with a view. Their lunch breaks are often filled with single track and sunshine. And after work, you can find them grilling burgers and sharing growlers on the deck. They don't hold back when at work or at play, and they don't accept "lukewarm" - in their attitude toward life...or in the temperature of whatever they happen to be drinking.

Hydro Flask was founded in 2009, when they launched the first all-insulated bottle line-up into the market. From modest beginnings, they exploded with hydration-loving fans everywhere to hit 1 million in sales by 2011. They then turned their attention to the beer market and launched the first-ever insulated growler. And they haven't stopped since.

They continually strive to bring new, innovative solutions to their customers. From insulated caps, to the lightest weight bottles in the insulated category, our dedication to their products and culture remains their number one focus. Six short years later, they now offer over 100 products in four different categories: hydration, coffee, beer and food.

They don't mean to brag, but they are proud of their accomplishments. They are honored to have made Inc 500's fastest growing company list and Outside Magazine's Best Places to Work list 2 years in a row and have received other product and industry awards as well.

In 2015, they expanded in Europe, with plans to go worldwide by the end of 2016. Through it all, however, one thing remains clear: they are committed to bringing you unexpected refreshment, wherever your adventures take you. Join them on their mission to save the world from lukewarm.

5% Back
A better water bottle can help create a better world. Through 5% Back, they give to multiple charities and non-profits-each helping people or the planet in a much needed way. Every time you purchase any Hydro Flask product, you can contribute to a cause.

561 Northwest York Drive
Bend, OR,
Phone: 888-584-9376 Fax: 888-276-0851 Visit website

About Hydro Flask

Hydro Flask settled in Bend, Oregon at the base of the Cascade Mountains with world class downhill and Nordic skiing, snowboarding, road and mountain biking, trail running, rock climbing, fishing, golf and other activities. Abound with outdoors enthusiasts from recreational hobbyists to professional athletes, word quickly spread in Bend and the surrounding area of the new container and its breakthrough technology. People were amazed after sipping ice-cold water from their Hydro Flask after it sat in a blazing hot car for hours and equally impressed after snowshoeing up a mountain and still being able to enjoy piping hot coffee at the summit.

Manfucturer Lifetime Warranty

They are so convinced that the Hydro Flask is the best double wall vacuum insulated bottle available that they guarantee every Hydro Flask against manufacturer defects for one hundred years or one lifetime, whichever comes first!

Although their lifetime warranty does not cover regular wear and tear, such as dents, scratches, powder coat chips from the flask being dropped, damaged, etc., it does cover manufacturer defects, such as:

  • Broken or leaking caps: If your cap breaks or you notice a leak, please contact us for a replacement cap – do not send your flask to us if it has a broken cap. You will be responsible for the shipping charge to have the flask returned.
  • Flasks that no longer insulate: You can test the insulation property of your flask at home by adding boiling hot water to the flask. After about 5 minutes you can feel the outside of the flask (below the neck), and if you feel any warm or hot spots, the vacuum has been compromised and you are eligible for a replacement.
  • Flasks that are damaged during the shipping process: Please let us know as soon as you receive your flask if it has arrived damaged. If you use your flask, they cannot replace it due to shipping damage. They will email you a pre-paid shipping label to return the damaged flask to them and they will send out a replacement as soon as they receive the damaged flask.
  • Rough welds along the rim of the flask: Their flasks are welded at the rim and on occasion, the welding can come out uneven. If you receive a flask that has an uneven rim or lip, please contact them for a replacement.
  • Rattling flasks: The rattle you hear is a small metal disc that sits between the double wall of your Hydro Flask that aids in the vacuum insulation process. Sometimes the disc becomes dislodged and you can hear a noise.  This will not affect the insulation of your flask.  If you can live with it, so can they. However, if it is an annoyance, they will exchange it with a new flask.

If you are not sure whether you have a defective flask and you have fully reviewed the care and cleaning page, please call them at 888.584.9376 or email them at [email protected] for further discussion.

If you are certain that your flask does have a manufacturer defect, please send your flask to:

Hydro Flask
Attn: Warranty
561 NW York Dr
Bend, Oregon 97701

When sending your Hydro Flask, please include your name, address, telephone number, email address and a brief note explaining what is wrong.

Average Rating

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100%1 out of 1 reviewers would recommend this product to a friend.
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By (Pasadena , CA )

the BEST thermos i have ever owned. no leaking even when tossed in my messenger bag. i forgot to drink my green tea and it was still hot at the end of my 10 hour work day.

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