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  • Recyclable polypropylene #5 is BPA-free, phthalate-free and toxin-free
  • Honeycomb Insulation™ inside cap adds additional temperature control
  • Soft, flexible thermoplastic urethane (TPU) strap has stainless steel pivots


View all Hydro Flask Water Bottle Accessories

REI membership


Best Use Multisport
Material(s) Recycled plastic
Dimensions 2.28 inches
Weight 2.5 ounces
Rated 5 out of 5 by from Best top for wide mouth Hydroflask bottles! I purchased a 20oz Hydroflask wide mouth bottle that came with a flip top lid. This lid seemed to leak a little if turned on its side and also had condensation when cold liquids are inside. This flip-top lid is not the best at insulating the drink inside because there is no insulation in the flip part of the lid. Therefore, I decided to replace the flip-top lid with the wide mouth flex cap and I love it! The handle is great for carrying and the lip is absolutely waterproof (no leakage) and it's the best at keeping your liquids really cold or hot! It is by far the best lid for any Hydroflask wide mouth bottle!
Date published: 2017-05-16
Rated 3 out of 5 by from Good Insulation and Convenient Handle Overall I like this product. The insulation will keep ice longer than I will ever need it to and the handle makes it convenient to carry. The issue I have is the rubber seal isn't removeable so if anything other than water is stored in the bottle, especially hot coffee or tea, it is impossible to ever get the smell cleaned out of the lid. I tried hot water and soap, soaking in baking soda and water overnight, baking soda paste, and even my PBW cleaner that I use for my Brewing equipment that works on everything, but since it cannot get underneath the seal it will not get it clean. So, great performance as long as you only use it for water. Three stars.
Date published: 2017-06-06
Rated 4 out of 5 by from It doesn't leak and it allows liquids to Flow Hydro Flask offers a number of covers for its wide mouth products. The coffee cover leaks and the flip-top straw top is difficult to use once the liquid in the container is low. This cover is a solution that solves the issues with the other covers.
Date published: 2017-04-11
Rated 4 out of 5 by from easy to carry I love Hydro Flask and am thrilled they finally made these lids available - I have an older flask with the older design of lid which isn't as easy to carry when it's full and heavy. The only reason I didn't give it 5 stars is because I think Hydro Flask is charging a little too much. Maybe $8 would have been a fairer price. I still bought it though, because it's such a great cap!
Date published: 2017-04-12
Rated 5 out of 5 by from Easy to hold and carry. I usually carry my Hydro Flask in a MOLLE style water bottle carrier. This makes it easier to get out of the carrier. Over all , I like this cap/strap combo. I think that a great improvement would be top make the sides of the cap with a more grippable surface. It's very smooth and slick and can make it a little hard to get the cap open.
Date published: 2017-04-22
Rated 5 out of 5 by from Replacement Cap This is a replacement cap for a Hydro Flash I already own. I like this cap because it has a handle. It makes it easier to carry when I'm working out at the gym.
Date published: 2017-05-09
Rated 5 out of 5 by from Works great Better than the flip cap. Keeps my hydro flask colder and it won't pop open in my backpack
Date published: 2017-05-09
Rated 5 out of 5 by from Makes HydoFlask More Versatile Bought cap to make HydroFlaks more secure (leakproof) and easy to carry.
Date published: 2017-06-05
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Will this fit the Hydro Flask Coffee & Tea mug (16 oz)?

Asked by: PPDD
​This lid will work with the Hydro Flask Coffee and Tea Mug.
Answered by: REIservice
Date published: 2017-05-27

when will these be availalbe?

Asked by: The Rumblefish
As of December 2016, we hope to have the Flex Cap within the next 30 days. Preorder dates are estimates and subject to change. Please contact us at 1-800-426-4840 for more detailed information.
Answered by: REIservice
Date published: 2017-01-17

Do these Flex caps fit on the wide-mouth Hydro Flask bottles that came with the old lids (the ones with a light grey stripe around the cap)?

Asked by: wannabegreen
​The Flex Cap fits all of the wide mouth Hydro Flask bottles.
Answered by: REIservice
Date published: 2017-01-23

Are these dishwasher safe?

Asked by: JackJr
​Hand washing is recommended.
Answered by: REIservice
Date published: 2017-03-24

Will this fit the member exclusive 24 oz coffee Hydro Flask?

Asked by: Pb94001
Yes, the member exclusive Hydro Flask is a wide mouth bottle and will work with this lid.
Answered by: REIservice
Date published: 2017-04-09
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