Blow Hot, Grow Cold – Thermoflask Vs Hydro Flask, Which One Should You Buy?

by | Apr 11, 2020

Remember Science 101? When we all learned that adult humans are around 70% water? So we all know how important it is to stay hydrated, right? And that’s fine when there’s a water fountain or a coffee shop nearby, but what if there isn’t? Well, No products found. or No products found. that’s what!

You’ve done your research, and you’ve narrowed your shortlist to two. In this straight-talking Hydro Flask vs Thermo Flask review, we take you through the features of both.

Thermoflask Vs Hydro Flask, Which One Should You Buy?

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No products found.

The double-wall vacuum insulated No products found. keeps drinks cool for up to 24 hours. Hot drinks stay hot for up to 12 hours. Sizes include 18 ounces, 32 ounces, 40 ounces, and 64 fluid ounces.

Its wide mouth allows easy pouring and filling, and it looks great. You can choose from several colors and two hydroflask lids. The powder coating makes it sweat-free – you’re less likely to drop it unintentionally. The stainless steel is 18/8 food-grade, so your drink tastes just as it should. It also has a lifetime warranty.

No products found.


Pros & Cons

The Brilliant Bits Of The Hydro Flask

Keeps drinks cool for up to 24 hours

Ensures drinks stay hot for up to 12 hours

Choice of two lids

Good range of sizes

Sweat-free powder coating

Lovely choice of colors

The Not So Brilliant Bits Of The Hydro Flask

✗ Not dishwasher-safe

Lids need to be purchased separately


No products found.

We also love No products found. We all enjoy a good chilled long drink, or a heavenly hot cup of tea or coffee wherever we are, but it’s not always practical to carry a cooler with you. You may not always have access to a microwave or kettle either.

Thermo Flasks keep your drinks refreshingly cool for up to 24 hours (12 for hot, reviving beverages). It ships with two lids as standard, the Chug Lid, and the straw lid, and the nifty built-in carrying handle means you can safely clip it to your pack.

The Thermo Flask is available in 6 different sizes and a small range of subtle, understated colors. It’s sturdy looking and its powder coating means you don’t need to worry about moisture rings or condensation. It stays cool to the touch from outside.

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Pros & Cons

The Brilliant Bits Of The Thermo Flask

Ensures cold drinks stay cold for up to 24 hours

Keeps hot drinks hot for up to 12 hours

6 different sizes

Ships with two lids as standard

Carrying handle and clip feature

The Not So Brilliant Bits Of The Thermo Flask

✗ Relatively limited choice of colors

✗ Design is quite bulky


Hydroflask Vs Thermoflask: Our Head-To-Head Comparison

To help you make your final decision, we take a side-by-side comparative approach to No products found. vs the Hydroflask. We look at the similarities, the differences, and the unique features.

To start with, they have a lot of things in common. They’re both very effective at what they do, and there’s a decent choice of sizes and colors. So let’s start by looking at the colors in more detail.


Red And Yellow And Pink And Blue – We Can Drink A Rainbow

We were really taken with the pretty lemon shade of the stainless steel No products found. with its wide mouth and leak-proof flex cap. The color really brightened our day.

Lemon isn’t the only color choice, though. There’s also black, graphite, frost or white. Brighter colors include citron, flamingo, or watermelon. Keen on green? Choose forest, jade, d-green, olive, or sage. Feeling blue? Opt for blueberry, dark cobalt, lilac, or pacific.

There is a small but select range of colors on offer in the thermoflask by contrast. Options are white, plum, cobalt, capri, and black.


Sizing Up The Opposition

We opted for the 32-ounce Hydroflask. Other hydroflask sizes are 18 ounces, 40 ounces, and 64 ounces. All have wide mouths for easy filling and pouring. (Did you know the typical coffee serving is 5 to 6 ounces, by the way, or that it varies around the world?)

Wondering how much space you’ll need in your messenger bag or backpack to accommodate the hydro flask? The 18-ounce flask is 8.1 inches high, weighs 11.6 ounces, and has a diameter of 2.91 inches (mouth diameter is 2.28 inches). It’s the only Hydro Flask in the range that will fit a standard vehicle cup holder.

The 32-ounce flask is 9.1 inches tall, with a diameter of 3.56 inches and a mouth diameter of 2.28 ounces. It weighs 15.5 ounces. The 40-ounce flask weighs 17.5 ounces: mouth diameter is 2.28 ounces, overall diameter 3.56 inches.

It’s 10.4 inches high. The largest flask in the range, the 64-fluid ounce container, weighs 32.1 ounces, is 10.4 inches tall, and has an overall diameter of 4.7 inches (mouth diameter of 2.28 ounces).

This stainless-steel water bottle known as the thermoflask is double insulated, with a choice of 6 different sizes, from 18 ounces to 64 fluid ounces. Other sizes are 24 ounces, 32 ounces, and 40 ounces.

We found No products found. just the right size to carry daily. It measures 12.6 inches high with a diameter of 4.6 inches and a weight, when empty, of 1.35 pounds. The lids stay in place well and are leakproof.


Cool Customers And Happy Heaters

The double-wall vacuum insulation and the TempShield technology in No products found. keeps drinks cold for up to 24 hours. If you like your coffee hot as can be, then you don’t need to worry for 12 hours as long as the lid’s safely in place.

The Thermoflask is also great at ensuring drinks stay ice cold for 24 hours, and wonderfully warm for up to 12 hours. The bottle is devoid of BPA. It’s not prone to rust and stays sweat-free. The outside stays cool to the touch no matter what’s going on with the liquid inside.


Lovely Lids

The Wide Mouth Flex Cap on the hydroflask has stainless steel pivots and a flexible strap. If the Wide Mouth Straw Lid is more your cup of (iced) tea, you don’t need to worry about making a mess.

The finger loop makes it extra convenient, allowing you to clip your Hydro Flask securely to your pack. It even comes complete with 2 long-lasting rubber straws. It’s not leakproof, however, nor recommended for use with hot liquids. No products found. comes with two lids as standard. You get a leak-proof Chug lid and a straw lid. The lids are made out of PP5 plastic with rubber tips. The vacuum insulated container’s double-wall feature keeps your beverage at just the temperature you like, and the wide mouth makes cleaning easy.


Care And Maintenance

You’re probably wondering if hydroflasks are dishwasher safe? The quick answer is no. To keep them in pristine condition and working well, use mild dish soap and warm (not hot) water in the sink or bowl. Dishwashers can get so hot that the insulation properties of the Hydro Flask can be affected and the powder coat damaged and discolored.

Wondering how to clean hydro flasks? Both No products found. and No products found. have wide openings and are easy to keep clean. It is not recommended to put either product in the dishwasher.


Warranty, Support And Additional Features

Hydroflasks are free of both phthalates and BPA, and the 18/8 stainless steel is food-grade. We also love the lifetime hydroflask warranty and the fact that you can have a choice of lids, the Hydro Flip or Wide Mouth Straw. The stainless-steel means there’s no transfer of flavor from the flask to your drink in either flask. Everything tastes just as it should.

No products found. is perfect “on the go”; the handle on the lid means you can carry it with ease. Its sweat-free exterior means you don’t need to worry about moisture rings on your desk (or any other surface) or condensation in your bag. The bottles are powder coated. The 18-ounce flask will fit most standard vehicle cup holders.


Buyer’s Market – Where To Buy Hydro Flasks

Whether you’ve decided on a Hydro Flask or a Thermo Flask (or a hydroflask or a thermoflask, come to that!) you want to get the best price, the widest choice, and the fastest service. Which is where Amazon undoubtedly has the edge.

Did you know, by the way, Amazon is now the world’s largest online marketplace? Or that back in the early days, it pretty much only sold books?


Hydro Flask Vs Thermoflask: Wrapping It Up

Both products performed well, for both hot and cold options. Both are double-walled with effective insulation, and both have a powder coating to help combat slippery fingers and condensation.

There’s not much in it, but on balance, No products found. (or hydroflask or even hydraflask) just slipped into the lead. We gave it a score of 4.8 out of 5 stars. No products found. (aka the thermoflask) scored 4.5.

We admit to being swayed slightly by the sleek design, the lovely hydroflask colors on offer, and the two straws you get with the lid. And on that note, it must be time for coffee?

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  Last update on 2023-03-25 / Images from Amazon Product Advertising API.

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