Equations that Changed the World Stainless Steel Vacuum Flask

3 reviews
$ 39.95 USD

Rather than looking up part-way through your proof to find – once again – that your coffee has gone cold, pour that precious brew into your fancy new math flask, and never have room temperature coffee again! Let yourself get lost in the elegance of your work and the beauty of the equations both on your page and on your flask. Wrapping around this brick-red bottle, you'll find some of the most important, groundbreaking equations our world has known. Now go ahead and add your equation to the list.

With a textured design for a unique tactile experience, this flask will keep your drink hot or cold until you're ready to enjoy it.

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!


Flat Rate $9.95
Orders $75+ ship for free
Expedited service available


Shipping is available to most countries. See details at checkout.

Shipping FAQReturns FAQ

You may also like

Peer Reviews

Customer Reviews
4.7 Based on 3 Reviews
5 ★
4 ★
3 ★
2 ★
1 ★
Write a Review Ask a Question

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
Joanne C.
United States United States

almost there!

Steel Travel mug: 1) The raised print on the "Equations that Changed the World" is fantastic. I really enjoy that tactile element on this beverage container. 2) opening and closing the top has gotten tricky. There is significant friction between the threads as metal rubs on metal when screwing on the top. 3) I am very pleased with the bottle's ability to retain heat. 4) love the handle!

Kathy P.
United States United States

Just got it and already want another!

Awesome thermos! Feels and looks like great quality. The textured feel adds to an already really cool design. I'm already wanting to buy another and I just received this one in the mail today!

Begona B.
United States United States

Very Pleased with Purchase!

I bought this flask as a Christmas present for my son, BUT NOW I WANT TO KEEP IT!! This is NOT a smooth flask! All the pictures and formulas are textured! I just LOVE this flask! I will definitely be purchasing one for myself soon.

Recently viewed