| 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!
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Peer Reviews
- Reviews
- Questions
United Statesalmost 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!
United StatesJust 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!
United StatesVery 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.