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Hydro Flask 32 oz vs 40 oz

No doubt, one of the essential things for an outdoor activity is packing the right amount of beverages, and if you’re looking for a quality flask for that purpose, it’s very common to end up searching for the Hydro Flask. In this article, I will be reviewing and comparing Hydro Flask 32 oz vs 40 oz wide mouth to help you to pick the most suitable size for you.

In summary, the main differences between the two sizes are their capacity and height, 40 oz model is 1.8″ taller than the 32 oz. So, If you’re not thinking of carrying your bottle in your backpack all day long, Hydro Flask 40 oz is great, you don’t need to refill it three times a day, but Hydro Flask 32 oz is the more popular and the main reason is it’s a more convenient size, it offers enough capacity for taking with you to the gym or a hike without the need of refilling again.

Hydro Flask 32 oz Wide Mouth Review

Hydro Flask 32 oz
  • VOLUME: 946 mL
  • MOUTH DIAMETER: 2.26″ / 5.74 cm
  • DIAMETER: 3.58″ / 9.09 cm
  • HEIGHT: 9.4″ / 23.87 cm
  • EMPTY WEIGHT: 15.2 oz / 430 gr

Since it offers the optimum capacity for daily sports or one-day activities Hydro Flask 32 oz Wide Mouth has become very popular over the last years, it’s very common to see it in the hands at the campus, at your gym, and even during hiking outdoors (even though it’s a little bit heavy for hiking adventures).

The reason is, not only it offers enough amount of capacity (32 oz) for one-day activities, but also it’s durable enough to last a lifetime (offers a lifetime Warranty) and does a great job keeping your beverages at your desired temperatures, and let’s face it, it looks darn good.

And also, Hydro Flask features Tempshield insulation technology to keep your beverages cold up to 24 hours and hot up to 12 hours.

I can hear you say that “But these are already offered in all Hydro Flask products. In what conditions should you buy the 32 oz size?”

  • Hydroflask 32 oz offers large enough volume to avoid having to stop halfway through to refill your bottle while exercising.
  • Likewise, if you’re into hiking long miles, Hydro Flask 32 oz offers enough capacity to keep you hydrated for a long lime but keep in mind that it’s a bit heavy for hiking especially when it’s fulled, so if you like to hike in places where you can access water and refill your bottle easily 32 oz Hydroflask would be unnecessarily big for you, but if you like to hike in places where accessing water is not very easy, then 32 oz Hydro Flask is what you should go for.

Hydro Flask 40 oz Wide Mouth Review

Hydro Flask 40 oz
  • VOLUME: 1.182 mL
  • MOUTH DIAMETER: 2.26″ / 5.74 cm
  • DIAMETER: 3.58″ / 9.09 cm
  • HEIGHT: 11.2″ / 28.45 cm
  • EMPTY WEIGHT: 17.6 oz / 500 gr

The second biggest bottle after the Hydro Flask 64 oz, Hydro Flask 40 oz also has a wide mouth as well and it’s the perfect option for those who need more than 1 Liter of liquid.

Unless you’re a very big, strong fellow who doesn’t mind carrying extra heavy and bulky gear, 40 oz size would be too big for outdoor activities, if you’re in the market for mainly outdoor activities then go for 32 oz Hydro Flask or maybe an even smaller size (depending on your refilling schedule).

But, this size is perfect if you’re not gonna carry it all day long in your backpack, you can fill it with hot coffee and take it with you to your boat, or in the summer you can fill it with cold beverages and take it to the beach.

I will get into details of every feature one by one below, but it’s important to mention that, just like the 32 oz version, Hydro Flask 40 oz can keep your hot beverages hot up to 12 hours, and cold ones cold up to 24 hours.

Differences of Hydro Flask 32 oz vs 40 oz


Hydro Flask 32 oz vs 40 oz dimensions

Hydro Flask 32 oz and 40 oz sizes have exactly the same outer and mouth diameter, the only difference is, with 11.2″ of height Hydro Flask 40 oz is 1.8″ taller than Hydro Flask 32 oz (9.4″).

Important Note: Since they’re wide, neither of the sizes can fit in the vehicle cup holders, if you want to put your bottle in your cup holder the biggest size that can actually fit is Hydro Flask 24 oz Standard Mouth.


Respectively, Hydro Flask 32 oz and 40 oz weighs 15.2 oz and 17.6 oz when empty, 47.2 oz and 57.6 oz when they’re fulled.

So Hydro Flask 32 oz may be used in hiking trips if you won’t have a chance to refill your bottle, but Hydro Flask 40 oz is too heavy for carrying around in your backpack, it’s the better option if you’re going to carry it with your vehicle.

Similarities of Hydro Flask 32 oz & 40 oz


Both sizes are made of Durable 18/8 Pro-Grade Stainless Steel therefore they’re extremely durable, although the prices of Hydro Flask bottles are higher compared to the industry, know that they provide lifetime longevity (hence the lifetime warranty).

Since we’re talking about the material, it’s worth noting that the bottles are very easy to clean due to this quality Stainless Steel they’re made of. After cleaning it you won’t taste the previous beverage’s flavor (which is a very common issue with cheap bottles).

One and maybe the only con about the bottles is the caps durability. Even though they’re much durable compared to their cheaper alternatives on the market, they might break if you’re too harsh on the bottle. But the good thing is you can always buy the caps and lids separately.

Powder Coat

I believe this is one of the cool features that separates Hydro Flask Bottles from the other alternatives, due to their powder coating technology, Hydro Flask Bottles are slip-free and they have a wonderful texture, if you’ve ever held a Hydro Flask bottle before you might know what I’m talking about.

They don’t feel like the cold, annoyingly smooth tin bottles, you feel the quality of the bottle when you touch it.

Thanks to this Color Last Powder Coating technology, the bottles look very good and you get a lot of color options as well.

And lastly, it’s important to mention that you can use a dishwasher for cleaning a Hydro Flask bottle.


Both Hydro Flask 32 oz and 40 oz offers 11 different colors, here are your options, you can check the latest price and the availability of each color on Amazon by clicking the link below:

ColorHydro Flask 32 oz Wide MouthHydro Flask 40 oz Wide Mouth

Wide Mouth

The Hydro Flask Bottles have two different designs, Wide Mouth and Standard Mouth. With a diameter of 2.26″ Wide Mouth is 0.35″ wider than the Standard Mouth (1.91″).

And for our comparison of Hydro Flask 32 oz vs 40 oz, unfortunately, neither of the sizes comes with a standard mouth, both sizes offer Wide Mouth, If you’re interested in a Standard Mouth, the nearest size that has a Standard Mouth is Hydro Flask 24 oz.


Due to the double-wall vacuum insulation design (which is called TempShield), Hydro Flask 32 oz and 40 oz can keep your cold beverages cold up to 24 hours and they can keep your boiling hot beverage insulated for 12 hours.

Although the temperature retention depends on a lot of factors such as the outside temperature or how many times you open the bottle, they do keep your beverages at your desired level of coldness or hotness up to given hours.

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