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

Hydro FlaskStandard Mouth Lids- Accessory for Standard Mouth Water Bottle

Hydro FlaskStandard Mouth Lids- Accessory for Standard Mouth Water Bottle

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: 401196158

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Details

Brand
Hydro Flask
Capacity
1.1 Pounds
Color
Black
Recommended Uses For Product
Coffee Soup
Special Feature
TempShield™

🥤Fits all Standard Mouth Hydro Flasks

✂️Straw easily trim-to-fit

🛡️Leakproof & insulated cap

Frequently Bought Together

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

Hydro Flask Replacement Straws 3 Count (Pack of 1)

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

Description

🥤 Sip smarter, carry cooler — the ultimate Hydro Flask upgrade!

EASY CLEAN DESIGN - Removable parts and dishwasher-safe materials keep your hydration routine hygienic and hassle-free.
LEAKPROOF CONFIDENCE - Secure closure means no spills, no stress—carry your refreshment anywhere with ease.
HONEYCOMB INSULATED CAP - Maximizes temperature retention so your drink stays fresh and cool longer.
UNIVERSAL COMPATIBILITY - Seamlessly fits all Hydro Flask Standard Mouth bottles for effortless upgrades.
CUSTOMIZABLE STRAW LENGTH - Trim the flex straw to your perfect sipping length—personal hydration, perfected.

The Hydro Flask Standard Mouth Flex Straw Cap is a lightweight, BPA-free accessory designed to fit all Standard Mouth Hydro Flask bottles. Featuring a customizable straw, honeycomb insulated leakproof cap, and dishwasher-safe components, it ensures maximum temperature retention and spill-free transport for your favorite cold beverages. Perfect for professionals on the go who demand convenience and style in hydration.

Specifications

Brand	Hydro Flask
Capacity	1.1 Pounds
Color	Black
Recommended Uses For Product	Coffee, Soup, Tea
Special Feature	TempShield™ double-wall vacuum insulation
Age Range (Description)	Adults
Model Name	Flex Straw Cap
Item Weight	4.54 g
Material	Plastic
Number of Items	1
Included Components	Water Bottle Accessory
Product Care Instructions	Hand Wash Only
With Lid	Yes
Is Dishwasher Safe	Yes
UPC	810028842878
Manufacturer	Hydro Flask
Global Trade Identification Number	00810028842878
Item Package Dimensions L x W x H	11.69 x 4.53 x 3.11 inches
Package Weight	0.12 Kilograms
Item Dimensions LxWxH	2.9 x 2.3 x 3 inches
Brand Name	Hydro Flask
Warranty Description	Lifetime
Suggested Users	unisex-adult
Part Number	SFS001
Model Year	2022
Style	Flex Straw
Size	18 Ounces

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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