Poisonous Plants Stainless Steel Vacuum Flask

3 reviews
$ 39.95 USD

Fill this Poisonous Plants Vacuum Flask with your favorite elixir so you can enjoy it at your own pace. Your hot tea or cold kombucha will be ready whenever you are, so you can feel free to get lost in your studies, plans, or walk in the woods.

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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A Cognitive Surplus Customer
United States United States

Cane Friendly and Quality!

I walk with a cane pretty often. Traditional mugs and travel mugs with no handle can be cumbersome and usually take up your whole hand. This mug, however, I can thread a finger or two through and still grab a plate, a book, even my uke. Not only does it make my life easier, but I was blown away by the quality! The print is GORGEOUS and I can even read the tiny print for the plant IDs. It's textured nicely, not flat, so it's secure to grip even when wet from washing. The handle is sturdy and gives leverage to open the right seal because this does close nice and tightly. It keeps my coffee HOT hot for a good long while, too. I honestly love everything about it and would recommend it highly.

Cognitive Surplus Poisonous Plants Stainless Steel Vacuum Flask Review
Kelly D.
United States United States

Must have

As always, their products are top notch! The handle on the lid is a game changer for me. It's the perfect size, keeps stuff perfectly chilled and the exterior designs have held up to repeated washings.

Deborah R.
United States United States

Poisonous plant flask

I bought this as a gift. They love it since they are into all kinds of plants.

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