Wide Mouth Flex Cap
$7.46
Regular Price $9.95

Wide Mouth Flex Cap

Wide Mouth Flex Cap is rated 4.2 out of 5 by 148.
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$7.46
Regular Price $9.95
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

Wide Mouth Flex Cap
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Insulated, flexible, and built to last.

Bike rides along the beach or snowshoeing in the backcountry — 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 up to 24 hours or hot 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
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:

  • 92 Non-profits supported non-profits.
  • $1.5 million Dollars donated donated.
  • 26,043 Bottles donated bottles.
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Reviews
Rated 5 out of 5 by from Best mug for the winter! used my lovely hydro flask while working outdoors all through the winter, it was the only cup that kept it hot!! All my other tumblers and flasks would go cold in within an hour of being outdoors. This kept my coffee so much longer and out did all of them! My favorite about this wide mouth flex cap version is since I'm always moving and on the go, I'm able to take a clip and hook it on my bag and not have to worry about spilling or forgetting it somewhere, just overall easy, and makes it insulated so much more! I definitely DEFIIIINTELY recommend.
Date published: 2020-08-16
Rated 5 out of 5 by from Exact replacement I misplaced the cap just days after buying my hydro flask. But it to my surprise the caps are sold separate and in different colors. I replaced mine and I received it within a few days. The shipping was so fast that I felt like I never even lost the cap at. I’m super happy with this product. This is my first review for any product and I truly believe it’s worth every penny.
Date published: 2020-06-19
Rated 5 out of 5 by from Great lid I’ve had this for several weeks now as a replacement lid. The seal is very tight and leak-proof. Lol sometimes it’s a bit too tight and I can’t open it myself
Date published: 2020-05-05
Rated 5 out of 5 by from Amazing I bought this about 2 months ago because I had found a hydro at the park with the straw lid ( I prefer screw on lid ) so I decided to buy this one and fit my hydro perfectly. I haven’t had any problems with it so far and works great.
Date published: 2020-04-11
Rated 5 out of 5 by from I love it!!! I bought this month ago am so happy. :) I love hydro flask bottle!!!
Date published: 2020-04-02
Rated 5 out of 5 by from It Fits I am not really sure what to say regarding the cap. I have had my HydroFlask bottle since 2013 so it is pretty darn sturdy (considering the number of times I have dropped it on concrete or on the trail). It rolled out of my vehicle one day, hit the asphalt and cracked the lid - the bottle is fine though. So I purchased this lid and yeah, it fits. Yippee!
Date published: 2020-03-19
Rated 5 out of 5 by from Question Are these lids now dishwasher safe? I saw the new wide mouth bottles are now dishwasher safe?
Date published: 2020-01-21
Rated 5 out of 5 by from Keep drinks cold for a long time This wide mouth flex cap-bottle is awesome. I have had to fight my husband cause he has claimed this bottle as his. Great made. Keeps drinks cold for a long time. Great for taking on a trip or just to the gym.
Date published: 2020-01-13
Rated 5 out of 5 by from ???? Does this lid fit 20 ounce wide mouth coffee bottle
Date published: 2020-01-10
Rated 5 out of 5 by from My Whole Family Loves These! I absolutely love my Hydroflask! It’s the best out there! My sons both have one, my daughter has one and now I as well. It keeps my water icy cold all day and it’s super durable. It also keeps coffee and tea nice and hot for hours. I absolutely recommend it and will be getting one for the hubby real soon!
Date published: 2020-01-08
Rated 5 out of 5 by from Exactly What I Wanted My Hydro Flask was given to me second hand with a flip-straw lid. I am not big on straws or those types of lids and to my satisfaction Hydro Flask sold lids separately. I bought the regular screw top for something sturdy, leek proof, and insulating. It works great!
Date published: 2019-11-26
Rated 5 out of 5 by from no leaks,great color,good for sports i just bought this for my lemon hydro flask. the color looks so good with lemon because i bought the watermelon cap. it use to always leak in a bin at vollyball now there is never a drop of water at the bottom of the bin
Date published: 2019-11-22
Rated 5 out of 5 by from Sturdy and keeps its seal Lid feels like its made well and one of the things that stands out most is that it keeps its seal. With other waterbottle lids they constantly start getting mold or the rubber seal completely comes out. That's not the case with these lids. Also, love the handle!
Date published: 2019-11-21
Rated 5 out of 5 by from Amazing I got this a month ago and I love this water bottle and it kept water extremely cold and hot. I love the water bottle so much. I had so many people come up to me and ask where I got. Of course I told them.
Date published: 2019-10-27
Rated 5 out of 5 by from great fit I lost the original cap to my hydro flask somehow? I was bummed and wondered if I bought another one, would it be a tight fit and not leak? any wide mouth lid should fit any wide mouth bottle, right? I am happy to say it fits perfect and there are no leaks!
Date published: 2019-10-25
Rated 5 out of 5 by from Excellent sealant I don’t prefer using straw, so I love this cap! Seals extremely well—no leaks! I like the handle on top too—flexible and very study. The lid is also insulated so it doesn’t just leave the job to the canister to do the job. I’ve had to be careful when I put hot tea in cos it stays hot for so long! You definitely get what you pay for.
Date published: 2019-10-24
Rated 5 out of 5 by from Perfect leakproof This cap is much better than the flip cap; which leaked. With this cap I have to remove the lid each time to take a drink from the bottle. Five stars would be a HydroFlask flip cap lid that does not leak. I would recommend this lid.
Date published: 2019-10-18
Rated 5 out of 5 by from Keeps hot things hot and cold things cold!!!! I really like the wide mouth on this thermo flask. While it's not good while driving, it's the best while at my desk. It has helped me consume more water daily. It really does keep hot things hot and cold things cold!! Very solid construction. I did read it is best not to put it in the dishwasher so be mindful of that.
Date published: 2019-10-14
Rated 5 out of 5 by from The best Love this bottle. I have to say I own a lot of items from Hydroflask and I love them all. This one keeps my tea warm all morning at work, and keeps water cold all day on weekend adventures. The only thing that could be improved upon is they do have a propensity to dent if dropped onto any hard surface - i like to think it gives them some added character.
Date published: 2019-10-12
Rated 5 out of 5 by from Love the cap! Love the wide mouth flex cap! Fits perfectly on my bottle, and keeps my hot drinks hot and my cold drinks cold. Bonus points for the build-in handle, perfect for clipping onto my bag when I'm on the go.
Date published: 2019-10-11
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Questions

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: 2020-11-05

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

Hello. I wonder whether this mouth cap also fit in 12oz insulated kids wide mouth bottle. Please let me know. Thank you.

Asked by: kana1215
Yes. It will fit all of our Wide Mouth Flasks.
Answered by: Consumer Service
Date published: 2020-03-17

can this fit on a 22 oz. regular mouth?

Asked by: oriley
This product only fits our Wide Mouth Flasks: Kids 12 oz; Coffee Flasks 12 oz, 16 oz, & 20 oz; and our Hydration Flasks 20 oz, 32 oz, 40 oz, and 64 oz.
Answered by: Consumer Service
Date published: 2020-03-07

Will this lid fit the kid’s 12 oz bottle that comes with a straw lid?

Asked by: Westcoastgab
Yes
Answered by: Consumer Service
Date published: 2019-10-29

Does this lid fit a 24 oz wide mouth?

Asked by: fernin23
Yes
Answered by: Consumer Service
Date published: 2019-10-29

 If used on a 16 oz HydroFlask widemouth coffee flask, will this cap be leak-proof? 

Asked by: Clara Q
None of our caps are advertised as leak proof, but this cap is the best for travel. As long as the cap is on properly and the gasket is intact, the cap should not leak.
Answered by: Consumer Service
Date published: 2019-10-27
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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:

  • 92 Non-profits supported non-profits.
  • $1.5 million Dollars donated donated.
  • 26,043 Bottles donated bottles.