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
14 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.

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
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


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 12 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:
Michelle C.
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. :)

Hannah T.

So beautiful.

So beautiful. Excellent quality and has a beautiful texture that feels amazing in the hands <3 thank you so much!

Deborah R.
United States United States

Star chart flask

This was a purchase for a Christmas gift. My niece loves it. She recently is studying the solar system.


Star Chart Stainless Steel Vacuum Flask

This bottle is absolutely stunning. I bought it as a gift for my dad, and while it definitely made a great Christmas gift, it's so nice that I almost wish I had bought one for myself too! I've purchased a few things from Cognitive Surplus at this point, and they never disappoint. Their designs on all of their products are always intricate and gorgeous, and they don't skimp on quality of materials either. If it's not clear, I highly recommend their products. I only wish that they made things for other interests, such as literature or history!

Minority Woman Owned Business

Small Business

Sustainable Practices

Inspired by Science

Inclusive Workplace