Star Chart 18 oz Steel Bottle

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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.

The science of how it works
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!



  • BPA-free
  • Hand-wash only
  • Carbon Neutral Shipping & Operations
  • Compostable Packaging

Materials & Specifications

  • 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