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

Hydro Flask Standard Mouse Flex Cap, Black

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

Brand
Hydro Flask
Capacity
1.13 kg
Color
Black
Recommended Uses For Product
Water
Special Feature
Dishwasher

💧Leakproof & dishwasher safe

♻️Recyclable eco-friendly design

🛡️Lifetime warranty protection

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 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

Manufacturer	Hydro Flask
Model Number	SFX001
Package Dimensions	14 x 9 x 6 cm
Material	Polypropylene
Color	Black
Size	1183 ml
Special Features	Dishwasher Safe, Leakproof
Cap Type	Flex Cap
Lithium Battery Packaging	Batteries only
Package Weight	0.08 Kilograms
Batteries Required	No
Batteries Included	No
Material Care Instructions	Hand Wash Only
Brand Name	Hydro Flask
Capacity	1.13 kg
Item Weight	4 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?

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