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!

Core Sample 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 hot days on dig sites, this Core Sample flask will make sure you've got ice cold water all day long. Take it with you next time you go fossil hunting or toss it in your bag and alight for the lab to analyze your most recent data set.

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 14 Reviews
5 ★
100% 
14
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:
KB
05/26/2022
Kathy B.
United States

Core Sample Stainless Steel Vacuum Flask

LOVE it!! It is so awesome and keeps my drinks both hot and cold for a very long time.

C
02/10/2022
Cloud

BR
01/24/2022
Becka R.

I love it!

I love it! You can feel how nice the quality is and the design is perfect! Would recommend:))

A
01/13/2022
Angela

Core Sample Stainless Steel Vacuum Flask

perfect for the paleontology lovers!

S
01/10/2022
Susi

TF
12/26/2021
Taylor F.

Looks incredible and is functional!

Looks incredible and is functional! I purchased this as a gift for a geologist and she was enamored. Can't recommend enough!

LC
12/19/2021
Linni C.

A Cognitive Surplus Customer
AF
12/17/2021
anna f.
United States United States

Perfect mug for any geo nerd :)

This mug is AMAZING. My brother (a geologist) is going to LOVE it.

NS
12/11/2021
Nicole S.

Core Sample Stainless Steel Vacuum Flask

Very well made and packaged nicely. My friend loved this unique tumbler!

R
11/11/2021
ritteran

Minority Woman Owned Business

Small Business

Sustainable Practices

Inspired by Science

Inclusive Workplace