Volume | 18 oz / 500 mL |
Width | 2.75" |
Height | 8.75" |
Opening | Wide mouth |
Material | High-grade stainless steel |
Cap Material | High-grade stainless steel, silicone ring |
Care | Hand wash (do not wash in dishwasher) |
Fill it with your favorite mulled hot cider or cold brew, and even if you don't get around to drinking it for hours, you can expect to find your beverage ready and waiting for you at just the right temperature. The metal cap seals tightly, so it won't leak all over your bag.
Here's how it works: the space between the inner and outer flask wall is evacuated, creating a vacuum (well, a partial vacuum anyway...). In order for heat transfer to take place from the outside world into your cold drink, or from your hot drink to the outside world, it needs nearby molecules to excite. If there aren't many molecules nearby, as is the case in a vacuum, the heat's energy can't easily be passed along, so your drink stays close to the temperature it was when you put it into the flask for a really long time.
Simply stated, vacuums make great thermal insulation!
USA
Flat Rate $9.95
Orders $75+ ship for free
Expedited service available
International
Shipping is available to most countries. See details at checkout.
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Peer Reviews
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Gift for Daughter
I got this for my daughter in nursing school, she loves it! Easy to fill with ice and it stays cold all day!

The price is worth the details
I’m an ER nurse and gave this mug as a birthday gift to one of the doctors. So glad I ordered it. The material was great and the details were amazing!
Human Anatomy Stainless Steel Vacuum Flask
Good quality and item matched the description
This was perfect!
This was perfect! The quality was top notch. Beyond expectations.

Nice thermos
Shipped quickly, arrived well packaged, and is will make. The illustration has a nice texture to it, and is easy to grip.

Human Anatomy Stainless Steel Vacuum Flask
This was a gift to my daughter who teaches high school biology. She loved it and will definitely be leaving it on her desk to inspire her students.

Stainless Vacuum Flask
Yes! I gave it to my husband for Valentines Day and he loves it!

Great quality
This water bottle is so cool. Everyone who sees it at work always compliments it! It would be an ideal gift for someone .