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Standard Mouth
Standard Mouth Flex Cap
$9.95
Regular Price $9.95
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Standard Mouth

Standard Mouth Flex Cap

Standard Mouth Flex Cap is rated 4.5 out of 5 by 191.
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$9.95
Regular Price $9.95
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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 have a friend with flexible measuring tape measure the distance between your C7 vertebra and the imaginary line between your thumbs. That’s your torso measurement. If you are between pack sizes, go with the smaller size.

  2. 2. Hip Measurement

    While 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

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Standard Mouth Flex Cap
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Details
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Moves with you.

Strong yet flexible, our Standard Mouth Flex Cap is the perfect companion for spontaneous campouts, epic road trips, and everything in between. Made with stainless steel pivots and an easy-to-carry strap, this cap has Honeycomb Insulation™ to help keep your drinks cold for up to 24 hours or hot up to 12. Pair it with any of our Standard Mouth bottles.

Product Benefits

  • Compatible with all Standard 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
Let's Go!

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

#HeyLetsGo

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

  • 151 Nonprofits supported nonprofits.
  • $2.5 million Dollars donated donated.
  • 68,822 Bottles donated bottles.
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Reviews
Rated 5 out of 5 by from Fits perfectly. Awesome product as usual Always a great product. Worth the money. Just wish it was a tad cheaper
Date published: 2022-09-21
Rated 5 out of 5 by from Matching cap and bottle Looks great with matching bottle. Matching cap looks so much better than the black cap that came with bottle.
Date published: 2022-05-26
Rated 5 out of 5 by from Nice! Looks great with matching boot and bottle. Works as expected. Good quality.
Date published: 2022-05-19
Rated 5 out of 5 by from Nice! Looks great with matching boot and bottle. Works as expected and is good quality.
Date published: 2022-05-19
Rated 5 out of 5 by from My favorite caps Good caps, works as expected. Another winner from Hydro Flask.
Date published: 2022-05-13
Rated 5 out of 5 by from Great cap! Love it! Works great! Replaces one that broke from falling out of my backpack too many times!
Date published: 2022-05-13
Rated 5 out of 5 by from Great Product! I was looking for a unique cap to go with my hydroflask and I was happy with my order! I got this cap with a matching boot and it was perfect. Very pretty and functional!
Date published: 2022-04-13
Rated 5 out of 5 by from Nice Bought as a replacement for original cap. Fits perfectly in original flask.
Date published: 2022-04-09
Rated 5 out of 5 by from Get one or two!! Love that these have carry handles!! I would love to see more colors and the spout so the lid doesn’t have to be removed
Date published: 2022-03-09
Rated 5 out of 5 by from Not as yellow as in the picture I loved this cap! But when I got it I saw the yellow is not as deep as in the picture. It would be nice if the picture depicted true color since I can't go to a store to look at it.
Date published: 2022-02-27
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Questions

Would this fit on the 12 oz kids Hydro Flask?

Asked by: SummerTime80
No, it would not.
Answered by: Consumer Service
Date published: 2020-11-05

Is there a straw cap for the 25oz wine bottle?

Asked by: Jab77
No, only the Standard Mouth caps will fit the 25oz Wine bottle.
Answered by: Consumer Service
Date published: 2020-07-29

Will this top fit the 25 oz wine bottle flask?

Asked by: Lsherm
Yes, our standard mouth caps will fit on the wine bottle.
Answered by: Consumer Service
Date published: 2020-04-10

Will this one fit on the 12oz kids one? I have ordered one for her and she keeps coming home from school and it leaks all over her backpack.

Asked by: izzybizzie200
The standard mouth caps will only fit the standard mouth bottles. Please contact customer service at 888-584-9376 to discuss this further.
Answered by: Consumer Service
Date published: 2019-10-29

Will this fit an 18oz hydro flask? If not, is there a lid for an 18oz like this?

Asked by: hopefulhydroflask
This cap will fit the 18oz standard mouth flask.
Answered by: Consumer Service
Date published: 2019-10-28

I lost my old cap from the bottle bought back in 2015. Does this fit the old 21 oz standard bottles?

Asked by: bkelly808
It should, yes. If you purchase one and it does not fit, please contact customer service at 888-594-9376.
Answered by: Consumer Service
Date published: 2021-06-08

Will this cap fit 25 oz Wine Bottle?

Asked by: Sue95
Yes, the Standard Mouth Flex Cap will fit the 25oz Wine Bottles.
Answered by: Consumer Service
Date published: 2019-06-13

Our 21 oz, insulated flasks are our favs but over time, water got into the caps and the standard rubber ring developed mold.  Took it apart & cleaned it, but the seal is discolored & water is difficult to remove from cap.  Will new design solve this? 

Asked by: Nancy39
We'd be happy to replace your cap for you under our Lifetime Warranty. You can fill out a warranty claim here: (http://www.hydroflask.com/warranty/)
Answered by: customer servcie
Date published: 2018-05-01
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Hydro Flask supports non-profit organizations focused on building, maintaining, restoring, and providing better access to parks. Since 2017, we have been doing just that:

  • 151 Nonprofits supported nonprofits.
  • $2.5 million Dollars donated donated.
  • 68,822 Bottles donated bottles.