Peer Reviews
Astronomy 18 oz Steel Bottle
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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.
Infuser Basket Compatible
BPA-free
Hand-wash only
Carbon Neutral Shipping & Operations
Compostable Packaging
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$ 12.95
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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 |
2024 Holiday Shipping
For delivery before December 25th in USA:
- December 10th is the last day to order printed apparel
- December 15th is the last day to order all other products with Free or Economy shipping
- December 16th is the last day to order all other products with Priority shipping
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USA
Flat Rate $7.95
Orders $40+ ship for free
Expedited service available
International
Shipping is available to most countries. See details at checkout.
If you're shipping to Europe, Asia, the Middle East, or Oceania, please check out our European website for lower shipping rates and quicker delivery times.
Frequently Asked Questions
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When your order arrives, open it up and take a look. If anything isn't as expected, got damaged in transit, or doesn't fit properly, let us know and we'll make it right.
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Shipping is available to most countries. Simply select your country at checkout.
Shipping FAQIf you're shipping to Europe, please check out our EU website for lower shipping rates and quicker delivery times.
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We do our best to process and pack up orders within 1-2 business days. You will know your order has shipped when you receive tracking
information. Typically orders arrive within 1-8 days (depending on where you live) expedited shipping options are available at checkout. -
No problem! We offer full and partial refunds and exchanges. Read more here.
Further Research
Let customers speak for us
Can't tell why it's a second
Added this to my order at the last minute as it was discounted as a "second." totally cannot tell why it's a second- looks perfectly fine to me. Score!
Fabulous design
Purchased from my daughter in law's wish list- WOW.Such a cool design. I wish I had discovered it myself and could have surprised her. Quality is excellent. Keep up the good work.
Excellent!
Bought them for a gift for my daughter in law, a geologist and dinosaur fan. Lovely quality, well packaged. I did not know of yoursite- what a great discovery!
Susan B.
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