10 Best Soft Flasks Tested

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Hydration is key to having a good run.  Drinking water before, during, and after your workout improves cardiovascular performance and health, keeps you cool, improves the performance of your muscles and joints, and cleanses your body of toxins, among other benefits.

Fortunately, hydration technology has advanced quite a bit from the days of cross body canteens. Runners now have the option to use water bladders in conjunction with a matching carrier.  However, you don’t always want to wear a hydration pack or belt, or even carry a clunky water bottle. Luckily, soft flasks have been invented, allowing you to stay hydrated on your run while not having to carry around a water bottle for miles and miles.These are made in a very simple way and they let you to be less heavy during the running. Not all soft flasks are created equal, though. To see the best soft flasks on the market today, read our list of the 10 Best Soft Flasks.

Last Updated: July 21, 2017
by Brian Price :

You can find some more information following our list of top picks, which we have researched and added here for you. 

There are also a few questions and answers added near the bottom of this guide, put together by our team why conduct that extra bit of research.

Nomader Collapsible Water Bottle
  • Nomader Collapsible Water Bottle
  • 5 out of 5
    Our rating
  • Dishwasher Safe
  • Price: See Here
Hydrapak SF 150 SoftFlask
  • Hydrapak SF 150 SoftFlask
  • 4.8 out of 5
    Our rating
  • ISPO Design Award
  • Price: See Here
Sportszu Flexible Water Bottle
  • Sportszu Flexible Water Bottle
  • 4.5 out of 5
    Our rating
  • BPA free
  • Price: See Here

10 Best Soft Flasks

1. Nomader

1. Nomader
Nomader products were inspired by, you guessed it, nomads. Their gear, like the Collapsible Water Bottle, was designed for people with on-the-go, active lifestyles that are outdoors or travel frequently. This durable soft flask stores conveniently making staying hydrated on a long run a breeze.
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Volume
The Nomader Collapsible Water Bottle holds 22 ounces of water or another liquid. It can hold both hot and cold beverages.

Construction
The silicone construction of this soft flask is free of BPA, lead, PVC, phthalates, and other chemicals. It can hold hot or cold drinks, and rolls up securely with an attached belt-style strap. This soft flask is available in 9 colors to match every taste, wardrobe, or set of travel gear.

Durability
The silicone construction of this soft flask is made to withstand wear and tear, and can hold up to temperatures as low as -4 degrees Fahrenheit and as high as 248 degrees Fahrenheit. It is equipped with a removable heat protection sleeve. It is shatterproof and is safe for the dishwasher and freezer. The cap is leak proof because of its “twist and lock” design, and has an anti-germ spout cover.

Value
This is an averaged priced soft flask.
Pros
  • Durable, non-toxic, and eco-friendly construction
  • Holds cold and hot beverages
Cons
  • Must “pre-condition” the bottle for proper water taste

2. Sportszu

2. Sportszu
This colorful 3-pack of soft flasks can be rolled, flattened, or folded for easy storage. Each bottle in the set comes with a different design, which makes them convenient for families.
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Volume
Each flask in this set hold 700ml/23 ounces of liquid. These are only suitable for cold beverages.

Construction
These soft flasks are made of BPA-free, food grade materials. The hard snap lid will keep your flask closed, but users note that it must be closed very tightly or else you will experience leakage. Users also felt these flasks were awkward to hold because of a large plastic trim along the outside of the bottle.

Durability
Users report that this water bottle lasted through a variety of activities, including traveling, hiking, and running. Some users did report some leaking after about a week of use. Users also reported leakage from the cap.

Value
These are very inexpensive soft flasks, especially for being a set.
Pros
  • 3-pack
  • Safe materials
Cons
  • Potential for leaks
  • Not comfortable to hold

3. Hydrapak SF 150

3. Hydrapak SF 150
This ISPO Award-winning soft flask can be used with water for hydration or with gels for a on your run. Just be sure to wash the bottle out thoroughly after using a gel!
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Volume
This soft flask holds approximately 5 ounces of liquid or gel. The small size of this flask has many users stating that they use it exclusively for gels because it doesn't hold enough water to keep them hydrated on a run.

Construction
This Hydrapak SoftFlask is made of TPU to give it superior flexibility and durability. The removable top makes this flask easy to clean, which is especially important after filling it with an energy gel. It collapses for easy storage, but does not have a strap or hook to securely shut it or attach it to your clothes.

Durability
The TPU construction and welded seams make this bottle extremely durable against wear and tear and leaks.

Value
This is a very low priced soft flask, which makes sense due to its small size.
Pros
  • Can be used with liquids or gels
  • TPU construction
Cons
  • Users say it is too small for water
  • No security strap or hook

4. Salomon

4. Salomon
This soft flask compresses as you drink from it, instantly lessening the bulk to carry while you run. It is also one of the smallest flasks once fully compressed and folded.
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Volume
This flask holds 8 ounces of liquid. It is only suitable for cold liquids.

Construction
The Salomon Soft Flask is made of PVC-Free TPU. It can be folded small enough to fit in the palm of your hand, but has no closing strap or fastener to attach it to your outfit. Users report this bottle has an odd smell that never goes away. As a result, some users purchased a replacement flask after just a short time.

Durability
TPU is an extremely durable material, so this soft flask can stand up to bumps and drops. Some users report leakage after only a short period of use.

Value
This is an average priced soft flask.
Pros
  • TPU construction
  • Very small when collapsed
Cons
  • May leak
  • Funny smell
  • No strap or hook

5. Arino

5. Arino
If you like the shape of a free-standing water bottle, but want storage convenience, the Arino Collapsible Water Bottle could be exactly what you are looking for.
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Volume
This soft flask holds 22 ounces of liquid.

Construction
This bottle is made of medical grade, BPA-free silicon. The double-lid has a water tight seal, so it won’t leak when upside down or squeezed. It can hold cold or hot beverages ranging from -60 degrees to 200 degrees. A carry strap also secures the bottle in its rolled or folded form. This flask can stand on its own once filled, eliminating the need to constantly hold or store it. This makes it a great choice for work, school, or training.

Durability
Silicone is highly durable, so this soft flask can withstand being dropped on even the most rugged running trail. There were no user reported leakage issues with this flask.

Value
This soft flask is priced below average.
Pros
  • Real water bottle shape
  • Carry/security strap
  • Holds hot and cold beverages
Cons
  • Does not necessarily hold the temperature of liquids

6. SLS3

6. SLS3
The SLS3 Soft Flask is extremely lightweight, adding minimal bulk to your running gear. The bite valve makes it easy to use while in motion, whether you are running, hiking, or training at the gym.
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Volume
This flask holds 17 ounces. It holds cold liquids only.

Construction
This bottle is made of collapsible BPA-free material. Even with welded seams, it weighs only 28 grams. The bite valve helps keep air out, preventing the water from sloshing around inside the bottle while you run, eliminating the potential for distractions or gait disruptions.

Durability
Although this bottle is highly durable and leak proof, users report that it may be too much so. The leak-proof cap is reported to be very difficult to open and close, so users recommend using a different bottle while racing. However, users also note that it is a great choice for people that throw their water bottle into their bag or purse, because it definintely won't leak!

Value
This is a slightly below average priced soft flask.
Pros
  • Leak proof
  • Very lightweight
Cons
  • Top is hard to open and close, so not good for races.

7. ITYYT

7.  ITYYT
Available in 4 colors, this soft flask is built with a wide mouth so you can put ice inside for extra cool refreshments.
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Volume
This bottle holds 26 ounces. It can hold cold beverages with ice, or it can hold moderately warm drinks, up to 100 degrees.

Construction
FDA approved, BPA-free medical grade silicone was used to construct the ITYYT Collapsible Water Bottle. It can withstand temperatures from -40 to 100 degrees, holding both cold and hot beverages. It is also capable of accommodating ice cubes for those runners that enjoy a freezing cold drink during their workout. After rolling up, this soft flask can be held securely with a strap.

Durability
Silicone is highly durable, and can withstand being dropped on a run, thrown into your bag, or a cycle through the dishwasher. The lid seal and valve are leakproof, and the cap keeps out dust and debris. Some users report that the closure strap fell off after a few uses.

Value
This is an inexpensive soft flask.
Pros
  • Hot and cold beverages
  • Wide mouth for ice
Cons
  • Questionable durability of security strap

8. Katadyn BeFree Water Filtration System

8. Katadyn BeFree Water Filtration System
The Katadyn BeFree is a unique soft flask because it has a built in water filtration system so you can rehydrate anywhere your run takes you. Replacement filters are available to keep you using this flask for a long time.
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Volume
The Katadyn BeFree Water Filtration System holds 20 ounces of water. Water is the only liquid that should be used it this flask.

Construction
This collapsible soft flask is equipped with a .1 micron water filter, which can remove potential harms from your drinking water, including Giardia and Cryptosporidium . It has an EZ-Clean Membrane which tidies up with just a slosh of water.

Durability
The flask portion of this bottle is highly durable, but users have some reservations about the filter. The advise being extra gentle with it, as the small components can be damaged really easily. Replacement filters are available for purchase from Katadyn.

Value
This is a high priced soft flask. The high price is a result of the filtration system that is built into the bottle.
Pros
  • Water filtration system
  • Easy to clean
Cons
  • High price
  • Filter is fragile.

9. Ultimate Direction Bottle with Kicker Valve

9. Ultimate Direction Bottle with Kicker Valve
This TPU collapsible soft flask conforms to any shape and keeps you hydrated on the go. The bite valve makes it a good choice for both regular workouts and races.
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Volume
This soft flask holds 14 ounces. It is suitable for cold liquids only.

Construction
This soft flask is made of TPU. It is clear so you can easily see how much liquid is left in the bottle, keeping you aware of when it is time to fill up. The nozzle is a high flow bite valve, so getting a swig of water on your run is quick and easy. This feature is especially convenient while racing. Users noted that the fill head is very small, making filling this flask a difficult, messy task.

Durability
TPU is a highly durable material and is dishwasher safe.

Value:
This is an average priced soft flask.
Pros
  • TPU construction
  • Diswasher safe
Cons
  • Small fill head

10. Forward

10. Forward
The Forward Soft Hydration Water Bottle provides lightweight and collapsible hydration on your runs. The bite valve makes it convenient for racing.
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Volume
This soft flask holds 16 ounces of liquid. Only cold liquids should be used in this bottle.

Construction
This water bottle is BPA free. The bite valve speeds up hydration, which is a nice feature to have during a race. The two piece cap comes apart for easy cleaning and filling, ensuring that your water is always of high quality. Its collapsible and conforming shape makes it easy to store or pack on the go. Many users commented that the bottle made their water taste bad, even after washing it multiple times.

Durability
Users noted that even though this flask feels very thin, it is highly durable. It can withstand being thrown into your bag or a drop on a rugged trail.

Value
This soft flask is priced slightly below average.
Pros
  • Durable
  • Low price
Cons
  • May make water taste badly

The Criteria That We Used While Choosing The Best Soft Flasks

Finding a good soft flask isn’t an easy task. This is why we’re working really hard to provide the best products for our readers. Here are the factors that you should consider before purchasing the product. These factors were the most important for us while searching for the best product. You should carefully evaluate them as this may really have an impact on your satisfaction with the chosen product.

Size/ Volume/Shape

On the market, there’s wide range of soft flasks products. They can be used by everybody but when it comes to runners, the size or the volume are really crucial. While taking part in a race you can’t stop to drink some water. This is why soft flasks were invented. You should personalize your product. There is a wide range of sizes available on the market. Bigger ones are best for those who are very thirsty during race or a contest and they don’t have problem with taking something bigger. Those runners who aren’t very interested in carrying soft flasks who are bigger than usual, should choose the normal or a small version. The big problem that many runners encounter is that the producer offers only one size. This is a big inconvenience as it may to small for well-build men and he would have to take 2 or 3 packages to slake his thirst. On the other side, runners who need only a few of this product, they may be discouraged by the fact that this is an additional burden during the race.When it comes to choosing the shape, we don’t have a wide range of shapes. This is because the best shape that you can carry during the race is similar to rectangle. However, you can always check the measurements of the product. Producers very often give the details about  the width and length.  You may think that this is something that you should’t care about, usually soft flasks really fit you. However, you should check the measurements for one reason. If you want to carry your soft flask in your pocket, you must be aware that sometimes product is too big. We would recommend to check the measurements of the pocket and of the product and it will give you more confidence. The volume is very individual case. If you want to carry your soft flask with you, we would recommend to purchase 0.6 litres. It will make you feel hydrated and you won’t carry to heavy. On the market, there are also available soft flask with 2 litres and it’s perfect for cooling down after the race.

Leakage

The big problem when purchasing soft flask is finding the product which won’t be leaking. Even the most durable material or cap may not be enough.Even the best companies offer the products that may have problem with leaking. Sometimes, you unintentionally squeeze the product too much and the gel or water start to leak.This is because the cap isn’t strong enough to stay in place. However, buying a product which is harder to open isn’t the best idea. During the race, you may have problems with hydration as snap lid may be very hard to open. Leaking of the product is a very common problem among the runners. The leakage of the water is not a very pleasant thing as you have all your suit wet, especially the trousers and it doesn’t look good. Although the leakage of the water is really annoying, the leakage of the gel or any other substance is worse. This is because they have different  consistency and your whole pocket start to be sticky. What’s more, the smell of the gel may be a really terrible for some runners and that’s why a solid package is needed. This is why many runners decide to purchase their product in local store or that want to at least see the product and touch it. Best option is to check if the product is leakage-free and then you can purchase it online. Check if the cap is well made, it can’t be a cheap, plastic one. You can even try to squeeze the product to see whether the problem happens. Remember that if you close the product not good enough, it is obvious that it will leak so it’s not always the matter of the quality of the product.

Durability

Good durability is a key to success. Always check how the product was made and don’t search for products with lower class materials only because they’re cheaper.They are probable to last less months that those with normal prices.  Good test of durability of the product is to check if after 2 or 3 usages it smells okay. If the products smells bad, it’s obvious that this soft flask was made with very cheap material and we wouldn’t recommend to use it anymore. Low quality products aren’t durable but many readers can’t even check the durability because they throw them away much earlier. Why? Because some soft flasks, these poorly made, may change the taste of the water. This is something that is the most disgusting thing. Would you like to drink water with some chemicals in it?Checking if there is not any leakage while using the product is the best test for durability. As we’ve said before, it sometimes runner’s fault because he or she won’t close the cap good enough and there’s a leakage. If you see that you have a leaking soft flask, you may be sure that your product won’t be durable. Durability should be an important factor, you spend money on the product- you want the best quality. What you must remember is that you can’t keep your one soft flask for years. After this time, your product won’t be able to perform some functions that are essential to good hydration.

Other Important Factors To Consider When Selecting The Best Soft Flasks

These criteria aren’t the first to think of, but of course it doesn’t mean that they are worse. They are just unnecessary for some runners but for us they are still worth to know.

Additional conveniences

Beyond being used as a package for liquid substance, you should consider the other aspects of soft flasks. Let’s start with cleaning. Many buyers who buy this kind of product often complain about cleaning the product. It’s true because it’s not easy to clean and not every product can be washed in a dishwasher.Cleaning is an important part as it makes your device bacterial free. You should clean your device at least once a week or even more, it depends how much do you use it. It’s also a good idea to check if you can attach the product to your clothes. It may really make it easier to carry it, rather than wearing it in a pocket.It’s very uneasy, especially during the race or marathon, to check your pockets for the soft flask. It’s better to have it attached and you can run, observe the track and drink at the same time. Remember also that you need to read carefully the description of the product because not every package can be used with both liquid and gels. Sometimes you can pull the water only.This is is something that annoy many runners, when they can’t pull the liquid inside the tube. And if you want to fill the soft flask, you need to also make sure that it’s suitable for both hot and cold beverages. Pulling the hot water into the tube may really destroy it and we don’t really recommend to take hot water with you for a marathon or race. It will get much hotter and you won’t be able to drink it.

Price

Here comes the last factor to evaluate but of course not less important. As we said before, it’s not worth to search for really cheap products as they are likely to leak and they’re not very durable. They also can have an impact on water taste and smell.From the other side, the best products aren’t always the most expensive ones. You should really carefully check the price as there are other volumes. This is a common mistake that people buy a product that is cheaper but they forget to check the volume. We have got on our list the product from less than 10 dollars to up to 30. This is because we want to present the products that are available not only for rich people or very professional runners. We want to provide products for those who can’t spend too much on this kind of staff but they still want to enjoy good quality. people often compare the prices in stores to those in online shops. The differences aren’t big and you must remember that you must also pay for a delivery when you shop online. When it comes to soft flasks, we would really recommend to invest your money. Most of these products are reusable and you can enjoy them for a very long time. It’s a total must have for marathon runners. We know that they are give the water during the race, but your own soft flask is a perfect idea as you can fill it with energizing gel and boost your performance. It’s better to pay a bit higher price and enjoy the best quality.

Filter and rolling up

This is smoething that may be the most useful additional convenience. Filter is a great way to protect your health. Filters are built in soft flask to clear the water. It doesn’t let bacteria to get in. This convenience is adored by the runners who take part in mountain races. They can take the water from the lake. The filter will clear the water so you will be able to drink it with no worries about bacteria. Producers are aware that this option is very useful and attracts many clients. This is why, there are many products on the market and also on our list that have the filter. Above the filter, the second most demanded thing that runners really adore is easy rolling up the tube. When you use the product, there is less and less gel, it’s similar to ending of the toothpaste. This is why it’s easy to roll the tube – it is smaller and you have less problem with drinking. You would think that’s not an important thing but when you take part in the contest, you will know how crucial it is. During the race, it should be easy to roll the tube and drink. We’re talking about this because there are some products when the tube can be rolled. It’s very stiff and it’s really uncomfortable and it may have a bad impact on your running performance.

Look/style

We always must to talk about it because we really read all the users comments and this is why this factor is here. When running started to be not only a sport, but some kind way of life, many people started to really look for stylish devices for the running sessions. This isn’t a secret that you won’t to look good in your outfit with your running soft flask. This boosts your confidence and it gives you more power to overcome the obstacles. People really started to pay attention to details and the result is a wide range of soft flask to choose from. Producers happen to know that the nicer the product is, the biggest chance is for customer to buy it. We have soft flasks in many different colors. Flashy ones are the most popular, some even have reflective logos to be more visible for the others. We have different designs, there is a big variety of drawings that can be put on the soft flask in order to make us look different. This is very useful if we want to leave our product for a moment.If our product is different from the other, it’s less probable that someone will by mistake take our soft flask.

Weight

This is the factor that we at first didn’t intend to put on our list. while reading the reviews, we came to the conclusion, that for some runners this may be very important. The weight of the product may be a big thing for people who carry their soft flask in the pocket. You know the feeling when your pockets are full and you can’t even move freely because there to much staff in your pockets. A soft flask, even if it’s small, it may weight a lot. this may be a really uncomfortable experience as you have additional burden to carry. this may have an impact on your performance as one of your legs has harder task. Of course we’re not talking about something very heavy, but when you need to fight the wind resistance, even this little device may really make it harder for you to run faster.

Manufacturer Guarantees

If you shop online, you must be aware that the product may be destroyed during the delivery- it’s very rare but it happens. This is why you should check if the product is okay in the presence of delivery agent. Soft flask is this kind of staff that you must really check.This is because, in many cases there’s nothing like money back and etc. If during the making flask in the factory, something went wrong, you have a law to give back the product and to demand the new one. The hardest thing here is to prove that it is a factory fault not yours that the product is not complete or doesn’t work. The one thing that every customer hate is filling all the documents about the product if they want the money back or want a new product. This is why we recommend to really read carefully all our factors as to prevent from purchasing the product that will let you down.

FAQ

Q. Why should I use these soft flasks?

A. Good question. Imagine that you’re taking part in a race. After few miles, you start to be thirsty, you need a water or you won’t be able to finish the race. However, you can’t take a big bottle of water with you because it would have a really bad impact on your performance. What you do? You take soft flask, you can carry it in your pocket or you can usually attach it to your clothes. You are usually able to carry not only water but also other fluids, gels and other liquid substances. This boost of energy and hydration will let you to improve your performance and you will feel better after it. What we must underline is that the soft flask aren’t only for runners. they can be used by everyone. This is a good idea if you don’t want to curry the bottle with water. This solution is often chosen by people who love hiking in the mountains. During their excursion, they can take the water from river or stream ( of course if the soft flask has a filter).

Q. My soft flask started to smell badly. What can I do?

A. If your product isn’t old you should try to use some kind of antibacterial cleaner. The smell should disappear. If your soft flask starts to smell badly after not many usages, it may mean that it’s low quality product.

Q. What is this BPA?

A. BPA is a chemical that can be used to make many types of plastic. Some researches proved that it can get into the food or water and it may have a bad impact on brain and the other parts of the human body. That’s why a lot of products on our list is BPA-free.

If you are in need of packable hydration on the go, a soft flask may be a option for you. They are light, stowable, and easy to fill and clean. Use this review of the Best Soft Flasks to help choose the bottle that will keep you running for miles and miles.

Here we come to the end of our products and list of factors. This is the big challenge for us to find the products that are good quality and durable. There are many fantastic products on the markets so making this top 10 was quiet an uneasy task. We would like to tell that the best products for us may not be the best products for you. Every runner has different needs and you are the one who will take up the decision. You can study the article once, twice and then get the best product for you. We hope that we enabled you to make the best choice and we also hope you’re going to enjoy your product for a very long time.


 

Here are some sources that we looked at while conducting our research:

Sources

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