Placeholder Rivers & Mountains Stainless Steel Travel Mug | Cognitive Surplus

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Rivers & Mountains 18 oz Steel Bottle

$ 39.95
4 reviews
Item is in stock Only 0 left in stock Item is out of stock Item is unavailable

Hike all your local peaks and then navigate all the waterways you can find in your trusty kayak with this Rivers & Mountains flask to keep your tea hot and your water cold. Nothing's worse than summiting a mountain only to find your coffee's gone cold, and this flask is here to make sure that doesn't happen. Featuring an early illustration of great rivers and prominent mountains, let it inspire you to explore just a little bit further.

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.

Hand-wash only
Carbon Neutral Shipping & Operations
Compostable 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 | 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

••• Holiday 2023 Shipping Dates & Deadlines ••• 


Flat Rate $7.95
Orders $40+ ship for free
Expedited service available


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.

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Laurie D.
United States United States


This bottle is beautiful and excellent quality. The picture is textured and that makes it a pleasure for me to use and carry. Would definitely buy again!

Canada Canada

Functionally Handsome

Handsome design, exceptional quality, perfectly functional. These thermos (flasks/bottles) keep cold beverages — cold and hot beverages — hot. Easy to carry, drink from and clean. Highly recommended.

Austin Y.
Canada Canada

Water Bottle

Amazing product! I use this everyday and I love every time I get to drink out of it. Super good quality and looks awesome.

A Cognitive Surplus Customer
Natalie M.
United States United States

Christmas gift!

My sister is a riparian ecologist. This was the perfect gift for her, and she loves it! Very sturdy and well-made. It doesn't leak like some vacuum flasks.

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