If the 21 oz bottle you have has a standard opening, not a wide opening, it should fit.

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Standard Mouth Flex Cap Black

Q: Why so expensive? i can get it cheaper from hydro flask, rei, dick sporting goods, etc.

Sure you can , If dick sporting goods has the same brand and style

Q: Is this product authentic? Made by Hydroflask?

Hello Robert - Wendy from Tall Ridge here - This Hydro Flask Standard Mouth Insulated Sport Cap purchased from us is authentic. We are an authorized Hydro Flask dealer. Please feel free to check us out. We want you to feel comfortable with your purchase. All Hydro Flask products purchased from us are authentic Hydro Flask products.

Q: Does this work for the 64 oz growler?

Hello James - Wendy from Tall Ridge here - The Hydro Flask 64 ounce Growler is a Wide Mouth. The Hydro Flask Insulated Sport Cap is for the Standard Mouth bottles only.

Product ID: 368861996

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Details

Brand
Hydro Flask
Capacity
1.13 kg
Colour
Black
Recommended Uses For Product
Water
Special Feature
Leakproof

💧Leakproof flex cap

♻️Recyclable materials

🛡️Lifetime warranty

Frequently Bought Together

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

Auto Flip Lid for Hydro Flask Standard Mouth Bottle, Spout lid for Iron Flask, Fits for Simple Modern and Most Brands, Replacement Lid with Button Lock, Black

Hydro Flask Flex Boot - Accessory Silicone Water Bottle Protector - Dishwasher Safe, BPA-Free, Non-Toxic Small

Description

💧 Stay refreshed, stay unstoppable with Hydro Flask Flex Cap!

ECO CONSCIOUS DESIGN - Crafted from recyclable materials to keep your footprint light.
ULTIMATE PORTABILITY - Standard mouth flex cap designed for easy-carry comfort on the go.
UNMATCHED DURABILITY - Backed by a lifetime warranty for worry-free hydration.
TEMPERATURE LOCK TECH - Honeycomb insulation keeps drinks hot or cold longer.
SEAMLESS COMPATIBILITY - Fits all Standard Mouth Hydro Flask bottles for effortless swapping.

The Hydro Flask Standard Mouth Flex Cap in sleek black combines durable, leakproof design with advanced Honeycomb insulation to maintain your drink’s temperature longer. Made from recyclable materials and backed by a lifetime warranty, this flex cap offers easy portability and fits all Standard Mouth Hydro Flask bottles—perfect for professionals who demand reliable hydration anywhere.

Specifications

Brand	Hydro Flask
Capacity	1.13 kg
Colour	Black
Recommended Uses For Product	Water
Special Feature	Leakproof
Age Range (Description)	Adult
Product Dimensions	5.9W x 8.5H Centimeters
Model Name	STANDARD FLEX CAP
Item Weight	4 g
Material	Stainless Steel
Number of Items	1
Pattern	Solid
Included Components	Lid
Product Care Instructions	Hand Wash Only
Cap Type	Flex Cap
With Lid	Yes
Is Dishwasher Safe	Yes
UPC	810497026885
Manufacturer	Hydro Flask
Global Trade Identification Number	00810497026885
Country of Origin	USA
Item model number	SFX001
ASIN	B06XPN4SFK

Have a Question? See What Others Asked

Why so expensive? i can get it cheaper from hydro flask, rei, dick sporting goods, etc.

Is this product authentic? Made by Hydroflask?

Does this work for the 64 oz growler?

Does it fit a 21 oz?

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

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Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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