Peer Reviews
Equations that Changed the World 500 mL Steel Bottle
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Rather than looking up part-way through your proof to find – once again – that your coffee has gone cold, pour that precious brew into your fancy new math flask, and never have room temperature coffee again! Let yourself get lost in the elegance of your work and the beauty of the equations both on your page and on your flask. Wrapping around this brick-red bottle, you'll find some of the most important, groundbreaking equations our world has known. Now go ahead and add your equation to the list.
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.
Designed in USA
BPA-Free
Compostable Packaging
Carbon Neutral Shipping
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 + BPA-Free plastic threads (threads not touch the drink) |
| 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.
Region |
Shipping Cost for orders €40+ |
Shipping Cost for orders less than €40 |
| EU | FREE | €5.95 |
| UK, EEA, Europe (non-EU), Türkiye | FREE | €9.95 |
| Middle East, Oceania, Asia | €35 | €35 |
| South America, South Africa | €40 | €40 |
If you live in the UK, EFTA, or anywhere outside of the EU, taxes and import fees may be due upon delivery.
For orders shipping to North America, use our USA website for quicker transit times and more affordable shipping costs.
Delivery to zip codes that UPS considers to be "Remote" are charged the UPS Extended Service area fee of €30 in addition to the standard shipping rates.
Orders are processed within 1-3 days (Monday-Friday)
Shipping by GLS & UPS 1-5 days
Please double check your shipping address before submitting your order. We are unable to update your address or cancel you order prior to shipping once it is in our system. If your package is returned to us due to an incorrect address or refused delivery, we will refund the cost of the items less a 20% restocking fee if the goods are still in saleable condition. Shipping costs are non-refundable.
To start a return please contact us using the contact form. Returns must be made within 30 days of placing your order.
Frequently Asked Questions
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We ship from The Netherlands to nearly all destinations within Europe, Asia, the Middle East, Oceania, South America & South Africa. You'll be able to select your country and add your address details at checkout. If you're able to find your country, we can ship to you!
Unfortunately at the moment, because of the current political situation, our shipping carriers have suspended delivery to Ukraine and Belarus, so delivery to these locations is not possible.
For destinations in North America & Central America, please visit our USA website.
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Region
Shipping Cost for orders €40+
Shipping Cost for orders less than €40
EU FREE €5.95 UK, EEA, Europe (non-EU), Türkiye FREE €9.95 Middle East, Oceania, Asia €35 €35 South America, South Africa €40 €40 If you live in the UK, EFTA, or anywhere outside of the EU, taxes and import fees may be due upon delivery.
For orders shipping to North America, use our USA website for quicker transit times and more affordable shipping costs.
Delivery to zip codes that UPS considers to be "Remote" are charged the UPS Extended Service area fee of €30 in addition to the standard shipping rates.
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We do our best to pack up orders within 1-2 business days. Orders ship via GLS or UPS depending on the weight and destination. Most orders arrive within 1-8 business days.
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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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No problem! We offer full and partial refunds and exchanges. Read more here.
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Due to the way we make our products, we are unable to customize single items. In general, we cannot change the kind of paper in the notebooks from what you see listed or change the colors, but we are always happy to hear what you'd like to see us make in the future!
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