Am I able to buy any of the bottles that already have the flex straw lid on them or do I have to buy that lid separately?

You are able to buy bottles that already come with a flex Straw cap, but for the availability of those units, you need to check with a dealer directly. Your Hydro Flask team.

Why does it state flex cap as being ‘girls’?

No idea. This came with a twist cap and it is fine. I use sports bottles with different caps for when in the gym etc. The hydroflask is a really solid design.

What diameter is the base

Hello, The diameter of both the 18 Ounce and 21 ounce Standard mouth bottle is 2.87 Inches or 7.29 centimetres.

Hi how do I know if it is legitimate?

it is legit, it's a great flask

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Hydro Flask - Water Bottle 621 ml (21 oz) - Vacuum Insulated Stainless Steel Water Bottle with Leak Proof Flex Cap and Powder Coat - Standard Mouth - White

Hydro Flask - Water Bottle 621 ml (21 oz) - Vacuum Insulated Stainless Steel Water Bottle with Leak Proof Flex Cap and Powder Coat - Standard Mouth - White

Product ID: 54301030

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Details

Brand
Hydro Flask
Capacity
21 Fluid
Colour
White
Recommended uses for product
Coffee Soup
Special feature
Straw safe

🔒Leak-proof flex cap

🔥Keeps drinks hot 12h

❄️Keeps drinks cold 24h

Description

💧 Stay refreshed, stay unstoppable.

LIFETIME WARRANTY FOR PEACE OF MIND - Backed by Hydro Flask’s lifetime guarantee, ensuring your bottle stays as reliable as your hustle.
BUILT TO ENDURE YOUR ACTIVE LIFESTYLE - Rugged stainless steel construction resists dents and keeps flavors pure—ready for every adventure.
EFFORTLESS CLEANING WITH POWDER COAT FINISH - Durable powder coating resists stains and makes hand washing a breeze—less time cleaning, more time living.
NO SPILL CONFIDENCE WITH LEAK PROOF FLEX CAP - Secure lid with carrying strap means zero leaks and easy transport, wherever you go.
TEMP SHIELD TECH FOR ULTIMATE TEMPERATURE CONTROL - Double-wall vacuum insulation locks in cold for 24h and heat for 12h, so your drink stays perfect all day.

The Hydro Flask 621 ml water bottle features double-wall vacuum insulation with TempShield technology to keep beverages cold for 24 hours or hot for 12 hours. Crafted from durable stainless steel with a powder-coated finish, it resists dents and maintains flavor integrity. The leak-proof flex cap with carrying strap ensures spill-free portability, while the bottle is easy to clean by hand. Supported by a lifetime warranty, this bottle is designed for professionals and adventurers who demand performance and style.

Specifications

Product Dimensions	2.85 x 2.85 x 11.1 cm; 23.68 g
Specific uses	Any Temperature
Item volume	600 Millilitres
Fabric Type	Stainless Steel
Fill material	Air
Anti-Tick Material	Stainless steel
Is mould resistant	BPA Free
Care instructions	Hand Wash Only
Dishwasher safe?	No
Is assembly required	No
Number of pieces	1
Warranty description	Hydro flask lifetime warranty.
Batteries required	No
Included components	bottle, lid
Import designation	Imported
Item weight	24 g

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