Placeholder Astronomy Star Chart Stainless Steel Vacuum Flask / Travel Thermos – Cognitive Surplus

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

Star Chart 18 oz Steel Bottle

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

Whether you're heading out to watch the Leonids on a chilly November night, or just enjoy taking your coffee with you wherever you go, this Star Chart Vacuum Flask has got you covered. Let it inspire you to stay out just a little longer to catch that one last shooting star or fuel your next great hypothesis. 

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.

Infuser Basket Compatible
Hand-wash only
Carbon Neutral Shipping & Operations
Compostable 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 | 530 mL
Width 2.75"
Height 8.75"
Opening Wide mouth
Features Infuser basket compatible
Material High-grade stainless steel
Origin Designed in Oregon, Built responsibly overseas
Cap Material High-grade stainless steel, silicone ring
Care Hand wash only

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


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


Buy It With

Infuser Basket for Stainless Steel Bottles

Out of stock

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 15 Reviews
5 ★
4 ★
3 ★
2 ★
1 ★
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:
Marc H.
United States United States

Unique water bottle

Works very well, left in the car for 9 hours on a very hot day, the bottle was almost to hot to touch on the outside but the water still had ice floating in it!

Jennifer L.
United States United States


We purchased three water bottles for gifts. All were well received. Love the patterns, top, and function.

Harkiran B.
Canada Canada

Well made!

I am so impressed with this bottle. It has a great secure handle, and the design is beautiful. I am so happy with my product, I feel such joy using it! I fully intend to purchase from here again! Larger sizes would be a great product too!

Michelle C.
United States United States

Great birthday present

My daughter loves this!!!

Denise B.

Very good quality.

Very good quality. It really keeps your beverages cool for quite a long time. Will be back to buy more soon.

Maeryn M.

My friend loved it!

My friend loved it! The item reached earlier than expected too! Thank you!

Kelly D.
United States United States

Love it!

It's very sturdy and hasn't dented even when I dropped it. The design is lovely!


Star Chart Stainless Steel Vacuum Flask

Absolutely beautiful bottle! I've purchased items from this shop many times and they've always been very beautiful and high quality.

Ellen Z.
United States United States

birthday present

My friend loved this flask…it’s the second time I’ve sent one as a birthday present…they are a hit!

Emma S.
United States United States

Love this!

I got this water bottle for myself a few months ago, and it has been AMAZING soon far! It keeps my water cold, it's easy to hand wash, and the texture acts as a satisfying fidget for my hands. I ended up buying two more as birthday gifts to family members. 10/10 recommend. :)

Minority Woman Owned Business

Small Business

Sustainable Practices

Inspired by Science

Inclusive Workplace