


💧 Sip smarter, stay hydrated, and never miss a beat with Hydro Flask’s leakproof flex cap!
The Hydro Flask Standard Mouth Flex Cap is a premium replacement lid designed for all Standard Mouth bottles. Crafted from 100% BPA-free polypropylene with stainless steel pivots, it offers a leakproof, durable, and hygienic hydration solution. Its flip-open design encourages more frequent sipping, while the dishwasher-safe construction ensures effortless cleaning. Backed by a lifetime warranty, this cap is the essential upgrade for active professionals who demand both style and function.





















| ASIN | B06XPN4SFK |
| Best Sellers Rank | #20,054 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #354 in Water Bottle Accessories |
| Brand | Hydro Flask |
| Brand Name | Hydro Flask |
| Closure Type | Snap |
| Color | Black |
| Customer Reviews | 4.7 out of 5 stars 1,533 Reviews |
| Global Trade Identification Number | 00810497026885 |
| Included Components | Lid |
| Is the item dishwasher safe? | Yes |
| Is the item microwaveable? | No |
| Item Type Name | Cap |
| Item Weight | 3.95 g |
| Manufacturer | Hydro Flask |
| Manufacturer Part Number | SFX001 |
| Manufacturer Warranty Description | LIFETIME |
| Material | Polypropylene |
| Material Type | Polypropylene |
| Model Number | SFX001 |
| Number of Pieces | 1 |
| Product Style | Flex Cap |
| Shape | Rectangular |
| Style | Flex Cap |
| UPC | 810497026885 |
| Unit Count | 1.0 Count |
T**H
Perfect fit for my bottle
Lost my old lid and this was a perfect fit for my bottle! They seal tightly, preventing any leaks, which gives me peace of mind when I toss my bottle in my bag. The wide mouth makes it easy to fill and clean, and the lid itself is durable and well-designed. I love the convenient carry handle, making it easy to take on the go. These lids have definitely enhanced my Hydro Flask experience, and I couldn’t be happier with the quality. Good to know I can find replacements if I lose them!
J**Y
Fits perfect
Fits. No issue
A**Y
Good cap!
I needed to replace the straw lid with a screw on cap to avoid leakage when traveling overseas. This definitely did the trick.
M**L
Nice accessory.
It's nice to have the screw of cap. I wanted another one, but I can't seem to find these now.
J**R
This should be standard on all models. Potential health issues with the plastic lids.
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.
G**E
Good replacement but leaks
It fits perfect! Looks exactly like the picture. It does unfortunately leak a lot if your bottle is tilted, so you really have to keep your bottle upright at all times unless you want all the items around it to get damp.
K**7
as described and works perfect
Really good cover!!
H**L
Perfect fit!
Fast shipping and perfect replacement fit! The kids in middle school like to unscrew these caps on kids whose water bottles are sitting in the side pockets when there walking. Daughters was upset it was her favorite water bottles and her books got wet. Thanks goodness for this replacement cap! She’s putting the bottle inside her bag now lol!
J**L
Super bouchon de gourde, super propre et solide
Je suis ravi de ce bouchon isotherme Flex Cap en métal pour ma gourde Hydro Flask ! Il fait un travail fantastique pour garder mes boissons à la température idéale pendant des heures. Ce que j’apprécie particulièrement, c’est sa facilité de nettoyage – un jeu d’enfant comparé à d’autres bouchons. Sa construction en métal inspire confiance et durabilité. C’est un excellent ajout à ma gourde, je le recommande fortement !
B**B
Pasdt super
Passt super, tolle Verarbeitung
C**N
Un peu de bon sens svp ..
Cher pour ce que c’est. C’est dommage de devoir remplacer un simple bouchon à ce prix là.
M**.
Tal cual se describe
Es un tapón totalmente metalizado, se ajusta perfectamente a mi botella de la misma marca. Lo Iñigo que espero es que no se oxide, tengo varias botellas de esta marca y todas fenomenal. Lo recomiendo
A**S
Viene perfecto
Viene perfecto para mí thermo..el anterior se me rompió
Trustpilot
3 days ago
3 weeks ago