Light Bottle, Huge Hydration
Stay hydrated through your fall adventures with the lightweight, leakproof, BPA-free 40oz Shatterproof Tritan™ Bottle.
TheJourney
...began in 2012 when we built a bottle that inspired adventurers to fill their flask, feel their best, and get going. We innovated a lid system to keep the cold in longer, make ice load easy, and never leak. We designed a satisfying hydration experience—one that gave a sustainable nod to the planet with every sip.
Finally, a bottle to love.
ADVENTURE AWAITS
To inspire, accompany and elevate life's adventures, one sustainable step at a time. We are there to explore all of them with you, wherever life takes you. Fill your ThermoFlask, feel your best, and get going.
Thoughtful Technology
Our intelligent Temp-Lock™ technology is engineered to lock in the temperature. It will keep the perfect temperature, just as you want. That’s how we truly elevate your life’s adventures: cold or hot, hour after hour, step after step.
OUR PART
By replacing single-use plastics with our sustainable ThermoFlask gear, you are consciously making a positive impact and joining the growing movement of eco-responsible adventurers.
Perfect for school and sports.
AGmomof4
Love my flask! I’d recommend it highly!
Suzee
Really great value and easy to clean.
Dillon J.
Keeps my kids water cold all day.
Emily J.
Out in the sun at 90 degrees for over 5 hours, my water was STILL COLD!
joyssiiaann
I love that it does not leak all over their backpacks.
Beach365
They are a great size, plus a great value.
Jeanette M
Perfect for school and sports.
AGmomof4
Love my flask! I’d recommend it highly!
Suzee
Really great value and easy to clean.
Dillon J.
Keeps my kids water cold all day.
Emily J.
Out in the sun at 90 degrees for over 5 hours, my water was STILL COLD!
joyssiiaann
I love that it does not leak all over their backpacks.
Beach365
They are a great size, plus a great value.
Jeanette M
Blog
The Cobalt CollectionIt curls over surfboards and fills the sky with a deep blue backdrop that’s perfect for fluffy, white clouds.
Blog
Your Bottle Planted a TreeThe ThermoFlask team traveled to Laguna Canyon and planted Coastal Live Oak trees at Laguna Canyon Foundation in participation with One Tree Planted. Also, with every purchase of a ThermoFlask reusable bottle, you have helped prevent over 2 billion single-use plastic bottles from littering our coast and our trails throughout the past...
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Which ThermoFlask Lid is Best For You?Design your favorite hydration experience with 6 of the Best Lids Ever™: Straw or Spout with 3 handle styles: swivel, wide swivel, and fixed loop.
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ThermoFlask’s Water Bottle Sling: An Adventure Essential For Day Trippers + 6 Trail TipsThere are 193 million acres of forests in the United States, and many of those acres are protected in over 100 national forests. When you hit the trail to find that oh-muh-gawwd spot that fills your IG feed, be a good nature steward and hike responsibly: choose sustainable, eco-friendly options...
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The Plum CollectionAs happy on a bicycle as it is clipped to your backpack, this fruity color—plum!—takes a queue from the quiet side of nature.
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How to Keep Your ThermoFlask CleanHow to keep your ThermoFlask bottle, lid, and o-rings clean.
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6 Winter Hiking Tips To Stay Hydrated and HappyWhen you’re heading out to hit the trails, whether that’s a one hour hike or a day journey, here are six things you should always do to make the adventure a great one...
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Top 4 Holiday Gifts For The Adventurer On Your ListStruggling to find that perfect gift for the adventurer on your list? We’ve got you, best gift-giver ever! Toss the clunky gizmos and gadgets and wrap up something they’ll love: an experience! We’ve rounded up four high-energy “get-out-there” things to do and paired them with thoughtful hydration gear that will fuel...
Blog
Five Best Fall ViewsThis is the best time of year to explore the great outdoors! Lace up your hiking boots and hit the trails hands-free with one of ThermoFlask’s bottle slings—we have three different styles to suit every adventure!