Hydro Flask Standard Mouth Flex Cap

Item No. 81049702688

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Product Description

With the Hydro Flask Standard Mouth Flex Cap, you can add to your Hydro Flask's functionality. Made with recycled plastic and stainless steel pivots, this flex cap is extremely durable and is easy to carry. With the Honeycomb InsulationTM, your drinks will stay cold or hot for several hours. Pair the Hydro Flask Flex Cap with any standard mouth Hydro Flask water bottles for a durable way to take your favorite drinks to go.

  • BPA-free and phthalate-free
  • Honeycomb InsulationTM keeps drinks cold or hot
  • Compatible with all Hydro Flask standard mouth bottles
  • Durable stainless steel pivots allow the strap to easily move
  • Weight: 2.5 oz.
  • Height: 1.91 in.
  • Material: Recycled plastic
  • Manufacturer's lifetime warranty


Customer Reviews

2.6 / 5.0
16 Reviews
5 Stars
4 Stars
3 Stars
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1 Star
Rated 1 out of 5
standard mouth lids choices big drawback
Love the flip lid for wide mouth that I own. The pop out lid for standard is very difficult to get into position, and impossible to get a reliable close. really missed on this one.
June 17, 2020
Originally posted at
Rated 2 out of 5
breaks easily
bumped it and the metal rivet on the side came off. I expected a sturdier product.
January 25, 2020
Originally posted at
Rated 2 out of 5
i think it is a great lid
i bought a lid and it was great just that it is way to squeaky when i open it and i wish it made less noise
December 27, 2019
Originally posted at
Rated 1 out of 5
doesn't fit
I have had a standard 18 oz bottle for about 5 years. My dog chewed the top so I ordered this one to replace it. It does not fit the 1.5" opening. I contacted customer service over a week ago and have not gotten a response.
October 5, 2019
Originally posted at
Rated 3 out of 5
Does replacement standard lid fit?
Was thinking that I'd buy a new lid for my older 24oz standard mouth water bottle but saw a review that said it didn't fit but your CS reply said call. Can you post if it fits or not or do I have to call?
September 30, 2019
Originally posted at
Rated 2 out of 5
Doesn’t protect from germs
Notice how the silver ring is exposed when the lid is on? That is where you put your mouth when you drink. Why wouldn’t they design the lid to cover where my mouth goes? Imagine places like an airplane or other public situations where your bottle makes contact with the real world? Make the plastic nest over the silver metal ring...
April 1, 2019
Originally posted at
Rated 3 out of 5
Broken strap!
I love my hydro flask! But one of the sliver disks that hold the strap broke off! Now I need to order a new lid!
February 14, 2019
Originally posted at
Rated 3 out of 5
It's great but a bit annoying
I love the conveinance of having my drinks staying cold in my hydroflask, but I do have an issue with this particular cap. The cap is great but it makes loud squeaking noises when opening and closing which I assumed was from the wet black rubber ring at the top. I took it out and it stopped squeaking but I left it in because I noticed that when I flipped the bottle water leaked out. Is there anyway to stop the squeaking noises when opening and closing my hydroflask?
January 18, 2019
Originally posted at
Rated 2 out of 5
No my favorite
my cold water gets warm really fast with this cap, the only good thing about this cap is that the part that I put in my mouth is not exposed to everything in the environment as the other cap.
August 27, 2018
Originally posted at
Rated 2 out of 5
Sport cap is not reliable
While the bottle is great, the sport cap is hard to push in and pull out. My daughter had it leak all over her backpack despite banging the heel of her hand on the cap to close. The standard cap is a pain to use. It would be good if Hydro Flask were to make a straw cap for the standard mouth bottle that is reliable and not rely on third party companies to develop these (those are not any good either). And while the large bottle is fine, it is not something you want to lug around while you are working out.
April 7, 2018
Originally posted at