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Wide Mouth
Wide Mouth Flex Cap
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Wide Mouth

Wide Mouth Flex Cap

Wide Mouth Flex Cap is rated 4.4 out of 5 by 271.
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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

Similar Wide Mouth Products
  1. Wide Mouth Straw Lid Wide Mouth Straw Lid
  2. Medium Flex Boot Medium Flex Boot
Wide Mouth Flex Cap
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Insulated, flexible and built to last.

Bike rides along the beach or snowshoeing in the great outdoors – it's easy to stay hydrated on the go with our Wide Mouth Flex Cap. Designed with stainless steel pivots and a flexible strap, this cap moves when you do. Plus, it’s made with Honeycomb Insulation™ to keep drinks cold for up to 24 hours or hot for up to 12 – no matter what the weather’s doing outside.

Product Benefits

  • Compatible with all Wide Mouth bottles
  • Honeycomb Insulation™ helps keep cold drinks cold and hot drinks hot
  • Durable, stainless steel pivots allow the strap to move easily
  • BPA-Free and Phthalate-Free
  • Lifetime Warranty
Technology
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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 Great Cap and Interchangeable Too This is a great cap. I could not find my cap and noticed that my son had put it on his water jug (that was not a Hydro Flask) because he lost his. I ordered 2 more since they are interchangeable. Love them!!!
Date published: 2022-07-27
Rated 5 out of 5 by from Good A good and important part of a hydro flask so it’s important to have a replacement at home
Date published: 2022-07-16
Rated 5 out of 5 by from The OG NO DRIP! That’s all I wanted in a lid, and this is the only one that keeps my bottle safe!
Date published: 2022-05-22
Rated 5 out of 5 by from Simple easy lid Adds a nice touch to your Hydro flask. Easy to put on easy to takeoff, plus the color is a great bonus.
Date published: 2022-05-14
Rated 5 out of 5 by from Super cute! There’s a little rubber piece that popped out of my original lid and was causing leakage. So I just bought this one on clearance and it’s been good as new.
Date published: 2022-05-06
Rated 5 out of 5 by from Good fit, easily removable, and cute! Cute color and its easy to remove. Fits perfectly too!
Date published: 2022-03-26
Rated 5 out of 5 by from Back-up top Bought this as a back-up top for my carnation 32oz bottle. I love the color, it fits great & the color contrast looks cool too. I try to have back-ups because you never know when you might need one. Quick shipping as always :)
Date published: 2022-02-24
Rated 5 out of 5 by from A touch of pink makes everything better! I love adding a pop of color to out Hydro Flasks with colorful tops and boots!
Date published: 2022-02-14
Rated 5 out of 5 by from Great Product Love the cap. Customer service representative was very helpful was so nice. Me and my wife both have bottles with this cap and love them. Thank you again.
Date published: 2022-02-04
Rated 5 out of 5 by from Wide Mouth Flex Cap - Stone Just needed a new lid, and this was on sale. Does the job.
Date published: 2022-01-25
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Questions

There is mold in my lid on the rubber seal. How do I clean this? I can't remove the seal from the lid.

Asked by: JGray
You should be able to use a toothpick to remove the gasket for cleaning. If you have any questions, please contact us at 888-584-9376 M-F 8am-8pm EST.
Answered by: Consumer Service
Date published: 2021-06-08

Will this cap fit a 32 oz. second generation hydro flask?

Asked by: fkrbgjake
Yes, we did not make any changes to our lid dimensions. This will be compatible with all our Wide Mouth bottles.
Answered by: Consumer Service
Date published: 2021-03-04

Does it fit on 12oz coffee with flex sip lid?

Asked by: yeontan
Yes
Answered by: Consumer Service
Date published: 2021-03-12

How can I remove the strap from my hydro flask wide mouth flex cap?

Asked by: Robert12
The straps are attached with a machine, unfortunately there is no easy way to remove the strap.
Answered by: Consumer Service
Date published: 2021-02-08

Is this cap for 40 once bottles????

Asked by: Bob55
Yes, it will fit on all Wide Mouths, including the 40 ounce.
Answered by: Consumer Service
Date published: 2021-01-27

Does it fit on a growler 64 Oz 18/8 stainless?

Asked by: Anonymous
It does not.
Answered by: Consumer Service
Date published: 2020-11-05

will there be a wide mouth flex cap in the Frost color?

Asked by: valentine
Customer service is alerted when those kind of things are released, so unfortunately, I can't give you a definitive answer.
Answered by: Consumer Service
Date published: 2020-11-30

Does This cap fit a 32oz hydro flask?

Asked by: poiuuytreq
We apologize in the delayed response. The wide mouth flex cap will fit the 32 oz wide mouth flask.
Answered by: Consumer Service
Date published: 2020-11-05
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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.