It's about the size around of a 16 oz plastic bottle of soda, but taller. It fits in my cup holder of my car. Don't think the larger one would. Since it keeps ice so well, I often refill it with water on the ice still in it. I don't consider it small or large. Like Goldilocks said, It's Just Right.

Do you sell the chug straw lid separately?

I had ordered a couple different 24oz pictured with chug lids, but I received straw lids. What I have eventually purchased was a 24 oz with both lids, to make sure I got the Chug lid! So ask your questions to make sure you're getting the right product :-)

Can I purchase a replacement straw lid for the Thermoflask?

Yes. I just went through this for the 40oz Thermoflasks I purchased at Costco. The straw lids are not sold by ThermoFlask directly (on their website) but it is sold by their manufacturer, Takeya, for $10. Www.takeyausa.com

Is the straw lid insulated?

Good question! The leak-proof straw lid will keep your drinks cold for up to 24 hours and hot for up to 12. It is not insulated.

Thermoflask Insulated Water Bottle 18 Oz 50055

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Description

💦 Stay cool, stay hot, stay ahead—hydrate like a pro with ThermoFlask!

PERFECTLY PORTABLE - 18 oz capacity fits most cup holders and backpack pockets, making it your ideal companion for daily adventures.
DUAL LID VERSATILITY - Switch effortlessly between a leak-proof chug lid and an enhanced straw lid for hands-free hydration on the go.
SLEEK DURABLE DESIGN - BPA-free stainless steel resists rust, flavor transfer, and sweat—perfect for your active, eco-conscious lifestyle.
TRUSTED HYDRATION HERO - Join 50,000+ happy users who rate it 4.7 stars—because staying hydrated never looked this good.
ALL DAY TEMPERATURE LOCK - Double-wall vacuum insulation keeps drinks icy cold for 24 hours or piping hot for 12 hours—no compromises.

The ThermoFlask 18 oz insulated water bottle features double-wall vacuum insulation that keeps beverages cold for 24 hours or hot for 12 hours. Made from BPA-free stainless steel, it includes two leak-proof lids—a chug lid and an improved straw lid—for versatile, one-handed drinking. Designed for portability and durability, it fits most cup holders and backpack pockets, making it perfect for active professionals seeking sustainable, stylish hydration.

Specifications

ASIN	B07RWKM7L1
Additional Features	Double Wall, Leakproof, Vacuum Insulated
Age Range Description	Adult
Base Diameter	2.91 Inches
Best Sellers Rank	#31,878 in Sporting Goods ( See Top 100 in Sporting Goods ) #1,325 in Sports Water Bottles
Brand Name	ThermoFlask
Cap Type	Straw Cap
Capacity	18 Fluid ounces
Color	Black
Customer Reviews	4.7 4.7 out of 5 stars (51,463)
Global Trade Identification Number	00885395500553
Included Components	Water Bottle With Lid
Is Oven Safe	No
Is the item dishwasher safe?	Yes
Is the item microwaveable?	No
Item Dimensions W x H	23H centimeters
Item Type Name	Water Bottle with Two Lids
Item Weight	313 g
Manufacturer	Thermoflask
Material Type	Stainless Steel
Model Name	Insulated Stainless Steel
Number of Items	1
Product Care Instructions	Hand Wash Only
Recommended Uses For Product	Water
Theme	Sport
UPC	885395500553
With Lid	Yes

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