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Birds 18 oz Steel Bottle

$ 39.95
Item is in stock Only 0 left in stock Item is out of stock Item is unavailable

Perfect for long days taking inventory of the museum's taxidermied bird collection or patient vigils waiting for a glimpse of an elusive specimen, this Birds Vacuum Flask will have your drink at just the right temperature whenever you're ready for it. Particularly if you're the type to get lost in your work for hours, it's nice to know that your tea won't have gone cold while you were having a moment of genius.

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.


BPA-free
Carbon Neutral Shipping & Operations
Composable Packaging

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!

Volume 18 oz | 500 mL
Width 2.75"
Height 8.75"
Opening Wide mouth
Material High-grade stainless steel
Origin Designed in Oregon, Built responsibly overseas
Cap Material High-grade stainless steel, silicone ring
Care Hand wash only
USA

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

International

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

If you're shipping to Europe, please check out our EU website for lower shipping rates and quicker delivery times.

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Returns & Exchanges

within 30 days of purchase

Free Shipping

On USA orders over $75

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Frequently Asked Questions

Peer Reviews

Customer Reviews
5.0 Based on 11 Reviews
5 ★
100% 
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Filter Reviews:
LS
08/08/2022
Leslie S.
United States

Vacuum flask

Very good quality and keeps drinks cold for a long time.

AA
05/11/2022
Alison A.
United States United States

Gorgeous and unique!

My daughter loves this! It's beautiful, functional, and durable. She really likes the texture of the decoration because it adds a little grip to the bottle so it's not slippery. We want about 5 more styles!

K
01/16/2022
KaraLynC09

KB
11/13/2021
Kenneth B.

RM
11/07/2021
Rachel M.

RP
09/08/2021
Rachel P.
United States United States

Wonderful, Beautiful, Sturdy

Amazing product, and good in lots of scenarios--I take it with me daily to class and rehearsal, and it's held up very well in my backpack.

MP
09/03/2021
Miriam P.
United States United States

Magnificent!

To be honest, I haven't drunk much out of my new flask yet, because I've been keeping it on my desk where I can just look at it. What a work of art! But that's silly, and I fully intend to make a habit of actually drinking from it -- only when I'm ready.

Cognitive Surplus Birds Stainless Steel Vacuum Flask Review
AM
06/02/2021
Alicia M.
United States United States

The best water bottle!

Yes, and bought one for my best friend who is also a birder. They’re gorgeous and also keep water incredibly cold. They’re the perfect size, too!

AR
05/01/2021
Anja R.
United States United States

Love the thermos

It is gorgeous and keeps things hot. Only thing is i wish it had a sippy lid so that i could drink coffee in the car

Z
02/14/2021
zlinn7

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