Star Chart Stainless Steel Vacuum Flask

12 reviews
$ 39.95 USD

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.

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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Customer Reviews
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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!

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