Jellyfish Stainless Steel Vacuum Flask

3 reviews
$ 39.95 USD

Whether you're heading out to walk on the beach or for a day of misty tide pool hunting, fill this Jellyfish Vacuum Flask with a hot drink for later and have it ready and waiting for you whenever you pause. 

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.

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Filter Reviews:
Taylor M.
United States United States

Love this bottle!

Purchased this bottle as a gift for my husband! It’s beautiful! We are kayak ecotour guides and he has received so many compliments from guests! It also keeps water cold during our Florida summers!

Seana M.
United States United States

Stainless Steel Vacuum Flask

I have bought 3 of these thermoses. I love the unique designs. Wish they came in a larger size. Gave it 4 stars because it dents easily.

Tracie C.
United States United States

Love it

I have flask from cognitive surplus. When I saw the new models I had to get another one. I like have the handle on the lid so I can easily carry the bottle.

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