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21 oz (621 ml) Lightweight Standard Mouth Trail Series™
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New Arrivals

21 oz (621 ml) Lightweight Standard Mouth Trail Series™

21 oz Lightweight Standard Mouth Trail Series™ is rated 4.6 out of 5 by 146.
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Size Chart
Hydro Flask Pack Size Chart
Available Sizes S/M M/L
Torso
Measurement		 18 - 19 in 19 - 22 in
43 - 48 cm 48 - 56 cm
Hip
Measurement		 22 – 46 in 26 – 46 in
56 – 117 cm 66 – 117 cm

  1. 1. Torso Measurement

    • A. Bring your chin to your chest and feel for the most prominent bony bump where the slope of your shoulders meets the back of your neck. This is your C7 vertebra and the top of your torso measurement.

    • B. On each side of your body, feel for the top of your hip bones, just below the sides of your ribs. With fingers pointing forward and thumbs pointing backward, draw an imaginary line between your thumbs. This is the bottom of your torso measurement.

    • C. Stand up straight and ask a friend to measure the distance between your C7 vertebra and the imaginary line between your thumbs using a flexible measuring tape. That’s your torso measurement. If you are between pack sizes, go with the smaller size.

  2. 2. Hip Measurement

    Although your torso measurement is the best indicator of your pack size, it’s still important to check your hip size when using a hipbelt. To find your hip measurement, wrap a flexible tape measure around the top of your hip bones, just below the sides of your ribs. This measurement is slightly higher than your waistline

<div class="description-pdp-content-text"> <h2>Less weight. More backcountry.</h2> <p>Ridiculously light, and durable enough for any trail, our 21 ounce Standard Mouth Lightweight Trail Series™ bottle is 25% lighter than our other 21 ounce bottles and provides the best cold hydration experience for your longest adventures. The narrow Standard Mouth opening is ideal for quick sips on the trail, and the slim bottle profile stashes easily into a pack pocket. Engineered to deliver lasting cold refreshment with TempShield™ insulation in an innovative lightweight stainless steel design. </p></div>

Less weight. More backcountry.

Ridiculously light, and durable enough for any trail, our 21 ounce Standard Mouth Lightweight Trail Series™ bottle is 25% lighter than our other 21 ounce bottles and provides the best cold hydration experience for your longest adventures. The narrow Standard Mouth opening is ideal for quick sips on the trail, and the slim bottle profile stashes easily into a pack pocket. Engineered to deliver lasting cold refreshment with TempShield™ insulation in an innovative lightweight stainless steel design.

Trail Series 21 oz Wide Mouth Lightweight Hydro Flask
Product image
Features
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Lightweight

25% lighter than our 21 oz (621 ml) standard mouth bottles means this lightweight stainless steel bottle weighs less, so you can do more.

Stainless Steel Construction

18/8 pro-grade stainless steel walls are thinner to reduce weight while maintaining durability.

Lightweight Flex Cap

The Honeycomb™ insulated wide mouth cap with a flexible perforated strap and aluminum pivots cut weight in our leakproof design.

Details
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    Product Benefits

  • Ideal for lightweight hydration to keep you going further
  • Fits most outdoor hydration filters
  • Durable 18/8 Pro-Grade Stainless Steel construction
  • TempShield™ insulation eliminates condensation and keeps beverages cold for up to 24 hours and hot for up to 12 hours
  • Flexible perforated strap and aluminum pivots for added weight loss
  • BPA-Free and Phthalate-Free

Size and Dimensions

Volume 621 ml
Diameter 2.8"
Height 10.2"
Weight 9.6 oz (283.9 ml)
Technology
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Colder, Hotter, Longer

Our unique double-wall vacuum-insulation protects temperature for hours. Cold drinks stay icy cold and hot drinks stay piping hot, so you can stay refreshed for any adventure.

We have great faith in our products

Hydro Flask guarantees this product with a limited lifetime warranty against manufacturer defects.

Let's Go!

Today is wide open. You lead, we'll follow.

#HeyLetsGo

Hydro Flask supports non-profit organisations focusing on building, maintaining, restoring and providing better access to parks. Since 2017, we have been doing just that:

  • 92 Non-profits supported non-profits.
  • $1.5 million Dollars (approx. £1.197 million) donated donated.
  • 26,043 Bottles donated bottles.
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Reviews
Rated 5 out of 5 by from Hydro-Fun Love the color, the convenience that it fits in my, my golf cart, my water bottle sling. I’m ready to buy so W more
Date published: 2022-09-23
Rated 5 out of 5 by from Keeps it cold! This is good looking, lightweight, and keeps my water cool for a long time.
Date published: 2022-07-29
Rated 5 out of 5 by from Great for hiking This is my first lightweight bottle. And now it’s my go-to for walking, hiking or vacations. Great to not have to carry more than necessary. But still love my standard ones for my desk, deck or anywhere else.
Date published: 2022-07-05
Rated 5 out of 5 by from must have so beautiful and lightweight. i use it everyday. Not that difficult to clean.
Date published: 2022-06-21
Rated 5 out of 5 by from Best Water Bottle I Own Best water bottle I own, perfect size for the trucks cup holder and keeps drinks cold a loooong time, it will keep ice for over 24 hours. I love the wide mouth and perfect size height and diameter…thanks!!
Date published: 2022-06-21
Rated 5 out of 5 by from Great! Just needs a boot Love the trail series so much we bought 4 to have a good range of sizes and they’ve become both our hiking flask as well as our everyday! The only downside is that the 21oz doesn’t have a boot made to match it so it can get rather annoying in cup holders in the car. But that’s a small thing. I will probably end up snagging another some time soon!
Date published: 2022-06-08
Rated 5 out of 5 by from The best water bottle Love my new lightweight hydroflask! Keeps water cold all day long
Date published: 2022-06-01
Rated 5 out of 5 by from Updating my water bottle.! Great weight; great look and a nice update for my daily driver stainless water bottle. After 10+ Years, it was time!
Date published: 2022-05-19
Rated 5 out of 5 by from Trail Series The Standard Mouth Trail Series Bottle is great! It is lightweight and easy to clean. It is all I am looking or in a Hydro Flask!
Date published: 2022-05-05
Rated 5 out of 5 by from Love it Love it. Light and seems durable. Finish looks great in the obsidian color.
Date published: 2022-03-06
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Questions

Will this fit in a standard bottle cage on a bike?

Asked by: spencer7
We regret to inform you that our products are not specifically designed to be carried in bike cages and they have not been tested for such use. We would be concerned about the possibility of the cage causing scratches, chips, and dents to your flask from improper fit and jostling. Therefore, we do not recommend carrying Hydro Flask products in bike cages.
Answered by: Consumer Service
Date published: 2022-07-20

Would this fit in the small protective boot size?

Asked by: Penglyn
No, we do not have boots for our Trail Series.
Answered by: Consumer Service
Date published: 2022-02-12

Will this bottle fit easily into your Small Packable Bottle Sling? I purchased a 21 oz. Timberline Collection bottle with the sling, and I could not fit that bottle into it.

Asked by: ChayaH
The Small Sling fits 18, 21, and 24 oz standard mouth bottles.
Answered by: Consumer Service
Date published: 2021-07-23

Is this dishwasher safe?

Asked by: Jenny21

I would like to get a 21oz lightweight flask with a sport cap. &nbsp;Do you have a sport cap that fits that flask? &nbsp;Which product(s) should I order?

Asked by: londoner

Hi, Is the lid 100% made by stainless steel material? I don&rsquo;t want the plastic to be in contact with the water&hellip;&nbsp; Thanks,&nbsp; Marta

Asked by: Marta7

Will the sport cap fit on this line?

Asked by: lizzieh6464

Will the sprout cap fit this bottle? &nbsp;Are they&nbsp;sold in stores?

Asked by: Nanc
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Hydro Flask supports non-profit organisations focusing on building, maintaining, restoring and providing better access to parks. Since 2017, we have been doing just that:

  • 92 Non-profits supported non-profits.
  • $1.5 million Dollars (approx. £1.197 million) donated donated.
  • 26,043 Bottles donated bottles.