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

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Hydro Flask Standard Mouse 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: 744523673

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Details

Material
Polypropylene
Color
Black
Brand
Hydro Flask
Item Weight
4 g
Number of Pieces
1

💧Leakproof & dishwasher safe

♻️Recyclable eco-friendly design

🛡️Lifetime warranty protection

Frequently Bought Together

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

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

Description

💼 Stay hydrated, stay unstoppable with Hydro Flask Flex Cap!

ADVANCED INSULATION TECH - Honeycomb insulation keeps drinks hot or cold longer
ECO CONSCIOUS BPA FREE - Safe for you and the planet with recyclable materials
BACKED BY LIFETIME WARRANTY - Confidence in quality that lasts a lifetime
ULTIMATE FLEXIBILITY STRENGTH - Engineered for durability and comfort on the go
PERFECT FIT FOR STANDARD MOUTH BOTTLES - Seamlessly compatible with all Hydro Flask standard mouth sizes

The Hydro Flask Standard Mouth Flex Cap in black combines durable polypropylene construction with advanced honeycomb insulation technology to maintain your drink’s temperature longer. Designed for ultimate portability and comfort, it fits all standard Hydro Flask bottles, is BPA free, dishwasher safe, leakproof, and backed by a lifetime warranty—making it the perfect hydration accessory for busy professionals and outdoor enthusiasts alike.

Specifications

Brand	Hydro Flask
Model Number	SFX001
Product Dimensions	4.88 x 5.9 x 8.52 cm; 3.95 g
Color	Black
Material	Polypropylene
Wallpaper Pattern	Solid
Quantity	1
Laser Class	Dishwasher safe, Leak Proof
Included Components	Lid
Are Batteries Included	No
Model Year	2020
Item Weight	3.95 g

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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