|Volume||18 oz / 500 mL|
|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!
I so love this water bottle! I bought it for my brother's graduation and he has been using it nonstop. The artwork on it is perfect, and the only reason it received 4 starts instead of 5 is because the lid and metal hook is not as sturdy as I would have liked. It also takes a few tries to screw it on correctly. However, it is still absolutely worth the purchase!