Thermoflask vs Hydro Flask

All hikers need access to water. For that reason, it’s essential to have a good hiking bottle. Without a good bottle, you might find yourself in trouble. Your bottle could break on the trail, leaving you dehydrated, in danger and without drinking water.

Well-insulated bottles also offer you the luxury of very cold drinks, or cozy hot drinks, which can be a terrific treat on a long hike. If you’re choosing a new bottle, it’s essential to buy one that’s quality, durable and reliable.

Thermoflask and Hydro Flask offer some of the best bottles on the market. If you’re a serious hiker looking for a serious bottle, these two are good options. But according to your needs (and the hikes you like to take!), one might be better than the other. See here for our review of the best overall water bottle.

In this article we’ll be comparing these two models:

HydroFlask Double Insulated HydroFlask Double Insulated


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ThermoFlask 24 Ounce Insulated Stainless Bottle ThermoFlask 24 Ounce Insulated Stainless Bottle


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To find which one is best for you, read on!

What Materials are the Bottles Made From?

Both bottles are crafted from high-quality stainless steel, with double-wall vacuum-insulated construction. Both flasks have an inner wall and an outer wall with a vacuum in the middle. Because of this build, the bottles stay insulated.

They’re both BPA-free.

Both bottles have a non-slip powder coating, so they’re not slippery, even when your hands are sweaty, making them very functional.

What Type of Lid do the Bottles Have?

Both bottles have a wide mouth for filling, making it easy to both fill and clean each model. This wide mouth also means that both bottles can easily be filled with ice – which is great for long, hot hikes.

But when it comes to drinking, the two bottles offer different options.

The Hydro Flask has a flip-top lid with a small hole to drink from. But Hydro Flask also sells a number of different lids that can be attached to the bottle. These include a straw lid and a leak-proof standard screw lid.

The Thermoflask comes with a leak-proof straw lid, so you can drink from the bottle while you walk. This lid also has a loop on it, so you can attach it to your belt or bag with a carabiner if you wish.

Does Either Bottle Leak?

It’s essential that a bottle doesn’t leak. Not only will you lose water (or whatever drink you’ve taken on your trek!), but any leakage might wet your pack or your clothes – or damage your phone!

This is where the two bottles massively differ. The Thermoflask is leak-proof but the Hydro Flask is not.

Yes, you can buy a Hydro Flask lid which is leak-proof, but the standard lid which comes with this bottle isn’t leak-proof.

If you want a bottle that’s less likely to leak, the Thermoflask is a better option.

For us, this is a pretty big dealbreaker. If you’re buying a bottle for hiking, you want to make sure that it won’t leak while you’re en-route. If your hikes are flat and gentle, the Hydro Flask might be enough. But if your trails require scrambling, with more technical sections, the Hydro Flask will leak.

Are the Bottles Durable?

Yes. Both bottles come with a limited lifetime warranty, leaving you with a good bottle for a good length of time.

That said, the Thermoflask is slightly more likely to sweat, which can, in turn, lead to rust. A sweaty, slippery bottle is also more likely to be dropped, which could lead to a broken bottle. That is pretty unlikely though, given the quality of the stainless steel (and the powder coating).

Which Bottle is Better Insulated?

When it comes to top quality water bottles, most perform much the same in terms of insulation.

In insulation tests over 24 hours, it’s rare to find any huge differences in the speed of heat transfer. When cold water is placed inside any top-quality stainless steel double-wall insulated bottle, then left for 24 hours, the typical temperature increase only varies slightly. And that’s exactly what happens right here.

The Hydro Flask offers a very slightly better performance in terms of internal temperature, but not enough for the difference to be a game changer at all.

Both bottles are very well insulated, so either bottle is a great choice for keeping cold water cold and hot water hot. With either bottle, heat retention is great, so it’ll be a long time before your drinks reach room temperature.

What are my Size Choices? And how much do the Bottles Weigh?

The Thermoflask model comes in only two size options – 24oz and 40oz. Meanwhile, this version of the Hydro Flask is available in sizes of 12oz, 16oz, 18oz and 20oz.

Different Hydro Flask models are available in larger sizes, but not this one.

If pack weight is of concern to you, the Thermoflask is a much better option and comes in at around half the weight of the Hydro Flask.

Which Color Options do the Bottles come in?

This is where the Hydro Flask is way ahead of the Thermoflask. It comes in 14 different colors, including kiwi, cobalt, and flamingo.

The Thermoflask is a double-pack, with one black bottle and one blue bottle. There are no other color options.

If you’re interested in aesthetics above all else, the Hydro Flask is the better choice.

What about the Price Point?

In terms of size to price ratio, the Thermoflask is the better option.

Other reviews to consider:

Are the Bottles Easy to Clean?

Both are fairly easy to clean. But because of the way the Thermoflask lid is built, it’s a little harder to clean than the Hydro Flask.

How Should I Clean my Bottle?

Cleaning your bottle is important to prevent the buildup of bacteria. The Oxo Good Grips Water Bottle Cleaning Set is a great way to clean all bottles properly and easily.

The kit has three pieces – a large bottle brush, a skinny straw brush, and a looped detail-cleaning brush. This kit is high-quality and very durable, so it’ll keep your bottles clean for many years to come.

The Final Call

Our pick is the ThermoFlask 24 Ounce Insulated Stainless Bottle. It’s more affordable and it’s leak-proof. Ultimately, as a hiker, you want a bottle that won’t leak on the trails. And unless you’re willing to buy extras, the Hydro flask will leak on all but the flattest of treks.

Yes, Hydro Flask craft great bottles – and this one has many plus points. But leaks are unforgivable. For that reason, our choice for hikers is the Thermoflask.

It’s great for hikes, lunch breaks, and camping trips. In short, it’s an excellent bottle for hikers. If you want to keep your water cooler for longer, grab a Thermoflask!

Read Hydro Flask alternatives or Hydro Flask vs Iron Flask, if you still haven’t decided yet.

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