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Hydro Flask

Hydro Flask Standard Mouth Lids- Accessory for Standard Mouth Water Bottle

Based on 9,489 reviews
Condition: New
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$9.95
Save $2.05 was $12.00

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At a glance

Condition
New
Style
Flex Cap
Color
Black
Model
SFX001
Capacity
2.5 lb
Dimensions
2.32"W x 3.35"H
Weight
3.95 g
In the box
Lid
Warranty
LIFETIME

Features 8

  • Body: 100% polypropylene, swivel: stainless steel
  • Imported
  • Compatible with all Standard Mouth bottles
  • Honeycomb Insulation helps keep cold drinks cold and hot drinks hot

Specs 33

Brand Hydro Flask
Capacity 2.5 Pounds
Color Black
Recommended Uses For Product Water
Special Feature Leakproof, Dishwasher Safe
Age Range (Description) Adult
Product Dimensions 2.32"W x 3.35"H
Model Name STANDARD FLEX CAP

Frequently asked questions

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Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

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View our full returns policy here.

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Top Amazon Reviews

This should be standard on all models. Potential health issues with the plastic lids.
Style: Flex Cap Color: Stainless Steel
This is exactly how they original lids were designed, then they went to plastic for almost all models. The plastic ones have a thin flat gasket and not an o-ring. It's super hard to get it to come out for cleaning. The plastic ones also are made of two parts that are snapped together in the factory. This is NOT a water-tight seal. So gunk gets inside and is a potential health problem. I drilled a hole in the plastic one and gray goo came out. The entire design of the plastic lids is faulty as cleaning is almost impossible. This, though, is all stainless steel. No seams or ways for water to get inside. It also has a standard o-ring that takes a second to remove and wash. This is also a normal industry-standard size. This is not a knock-off, but made by Hydro Flask/what came on the original model years ago and now is a replacement part. I think they sell one or two models with the stainless steel lid and everything else is plastic. This is a mandatory upgrade that will make your flask last 10-20 years without health issues. ... show more
Reviewed in the United States on July 8, 2024 by Joseph Oberlander
A must have
Style: Sport Cap Color: Black
I am not sure why this doesn't come standard. I am sure it probably has something to do with adding revenue, but it is so much better than the cap that comes with the bottle. I like this because it makes it easy to drink one handed. I am a HS principal, and I carry my Hydroflask around on duty with me. This make is easy to get a drink without having to find a place to drop my laptop and anything else I might be carrying with me. It cleans up well. It is not 100% leakproof. It will leak if you hold it upside down or shake it. Not huge amounts, but it does leak. I made the mistake of leaving it in my backpack on a flight to Europe last winter holiday. It sat in the overhead on its side for 8 hours. It leaked all over the overhead, and was sloshing around. My family was the only one that had luggage in that bin, so the only was the only looks I got. ... show more
Reviewed in the United States on December 3, 2023 by fuel98rider
Works well
Style: Sport Cap Color: Black
Works well. Just as described.
Reviewed in the United States on February 20, 2025 by MG
Great replacement lid!
Style: Flex Cap Color: Stainless Steel
Had bought my Hydro Flask years ago which came with a sports push/pall cap. Immediately after purchasing, I dropped the bottle and the lid would randomly leak. I had originally thought I bent the seal, but one day the entire push/pull came completely apart revealing the inside plastic had broken. Made me realize a replacement cap was possible. Decided to go with this standard lid. It feels durable and clean. A would do a few drop tests, but I am quite confident this will hold up! ... show more
Reviewed in the United States on June 10, 2024 by Wes Allan
Easy to clean but wish the spout had a sanitary cover
Style: Flex Straw Color: Black
Review Image by Jamie Jamie
Review Image by Jamie Jamie
Review Image by Jamie Jamie
Review Image by Jamie Jamie
Bought this for a 5 almost 6 year old to use with a kleen kanteen narrow mouth bottle. Pros - It fits the kleen kanteen bottle, looks very easy to clean (the red silicone can be pulled in and out for cleaning), and seems less awkward to drink from than the larger wide mouth spout. Cons: There is no way that I will be able to get her to open and close the straw without touching where she is going to to put her mouth. This is not a good solution for at school :(. it’s possible to do if you are really careful and only out the very tip in your mouth or if you your pointer finger but the likelihood of that happening is slim for a child. I bought this to replace the kleen kanteen sport cap because she used her fingers to open it and I didn’t like how it was always exposed. Due to this, I will sadly return it. Hydroflask could solve this issue by having a sanitary cover, making the spout longer, or possibly making the pull tab longer Another potential con is that is leaks more than the wide mouth straw cap when the straw is not pushed down. Another reviewer had a video of it. This wouldn’t be an issue for her at this age but it might be an issue for other families. ... show more
Reviewed in the United States on December 4, 2023 by Jamie Jamie
No more leaking!
Style: Flex Straw Color: Black
I bought this because my current lid was leaking. A lot. So I'm really happy this one doesn't leak at all! I initially had some trouble putting it on the bottle for some reason, but after a couple of days I've had no issues with that. The straw was easy to trim to the right length, and I haven't had to use the second one yet. ... show more
Reviewed in the United States on January 25, 2025 by Mary B.
So handy
Style: Flex Straw Color: Black
Loved my water bottle but hated having to unscrew the top to drink when working out. This solves the problem.
Reviewed in the United States on January 7, 2025 by clean clothes
Gym. Yes.
Style: Sport Cap Color: Black
Perfect for the gym
Reviewed in the United States on March 2, 2025 by Me2
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