This site has limited support for your browser. We recommend switching to Edge, Chrome, Safari, or Firefox.

Shopping in Europe? Check out our new EU site!

Astronomy 18 oz Steel Bottle

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

Fill this flask with some piping hot mulled cider, grab a blanket and your telescope, and alight for an evening of stargazing. Sit down to a morning astronomy lecture or let this flask inspire you to keep seeking answers to matters of spacetime.

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.

Shipping FAQReturns FAQ

 


Returns & Exchanges

within 30 days of purchase

Free Shipping

On USA orders over $75

Sustainably Minded

Inclusive Workplace & Eco Friendly Products

Frequently Asked Questions

Peer Reviews

Customer Reviews
5.0 Based on 3 Reviews
5 ★
100% 
3
4 ★
0% 
0
3 ★
0% 
0
2 ★
0% 
0
1 ★
0% 
0
Write a Review Ask a Question

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
A Cognitive Surplus Customer
MT
01/14/2022
Michal T.
United States United States

Beautiful flask

I bought this as a Christmas present for my boyfriend, and he's absolutely loved it! The design is gorgeous, and the flask is well built and sturdy.

SC
05/02/2021
Sheila C.
United States United States

Great product

Bought this flask for an Easter present for my son. Ice doesn’t melt quickly so water stays cold; perfect for taking to class or for a workout.

EE
04/01/2021
Eric E.
United States United States

Cool Flask

My girlfriend loved it. Keeps temperature for a super long time and has a pleasing texture.

Minority Woman Owned Business

Small Business

Sustainable Practices

Inspired by Science

Inclusive Workplace