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LifeStraw Flex Multi-Function Water Filter System with 2-Stage Carbon Filtration for Hiking, Camping and Emergency Preparedness,Black,10.6 x 3.9 in|26.9 x 9.9 cm

4.5 4.5 out of 5 stars 2,960 ratings
$34.94 $158.82 per cm
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Flex
Filter System
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Purchase options and add-ons

Brand LifeStraw
Special Feature Protects against 99.999999% of bacteria (including E.coli, Salmonella), 99.999% of parasites (including Giardia and Cryptosporidium), 99.999% of microplastics, heavy metals including lead, chlorine, organic chemical matter, dirt, sand, and cloudiness; improves taste See more
Product Dimensions 1"L x 1"W x 4.7"H
Package Information Bottle
Power Source No Electricity Or Battery Power Required
Item Weight 1.76 ounces
Model Name flex
Material
Bag is made of durable, TPU laminated nylon,BPA-free See more
Capacity
7 Liters
Included Components
Water filter
Purification Method
Activated Carbon, Hollow Fiber Membrane

About this item

  • Versatile water filter from the makers of the LifeStraw Personal filter can be used directly as a straw filter or inline with the included soft touch water bottle
  • Attaches easily inline to hydration pack bladders and gravity filters, or simply screw it onto a disposable water bottle
  • Advanced hollow fiber membrane removes minimum 99.999999% of waterborne bacteria, and 99.999% of waterborne protozoan parasites (up to 2,000 liters), and filters 0.2 microns; exceeds EPA drinking water standards
  • Replaceable carbon capsule reduces chlorine, lead and other heavy metals, bad taste and odor, as well as organic chemical matter like pesticides, herbicides, and VOCs (up to 100 liters)
  • System includes 2-stage Flex water filter, collapsible soft touch water bottle, and backwash syringe; filter measures 4.7 x 1 x 1 inches and weighs 1.7 ounces

Frequently bought together

LifeStraw Flex Multi-Function Water Filter System with 2-Stage Carbon Filtration for Hiking, Camping and Emergency Preparedne
$34.94 ($158.82/100 cm)
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Lifestraw Carbon Capsule Replacement for Flex Water Filtration System
$11.26
Get it as soon as Monday, Apr 29
In Stock
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+
LifeStraw Personal Water Filter for Hiking, Camping, Travel, and Emergency Preparedness
$15.63
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Product details

  • Product Dimensions ‏ : ‎ 1 x 1 x 4.7 inches; 1.76 ounces
  • Item model number ‏ : ‎ LSFX01BK01
  • Date First Available ‏ : ‎ August 17, 2017
  • Manufacturer ‏ : ‎ LifeStraw
  • ASIN ‏ : ‎ B074WK421F
  • Country of Origin ‏ : ‎ Korea, Republic of
  • Customer Reviews:
    4.5 4.5 out of 5 stars 2,960 ratings

Product Description

The LifeStraw Flex Water Filter System is a 2-stage water filter that can be configured to be used in a variety of different ways. Similar to the award-winning LifeStraw Personal filter, the LifeStraw Flex can be used by itself as a simple straw filter to drink directly from any source of water. The LifeStraw Flex can also function as an inline filtration system with the included soft touch water bottle, as well as a hydration pack bladder or a gravity water filter system. The Flex water filter even makes it possible to turn nearly any disposable water or soda bottle into a powerful water filtration system. Simply attach the Flex onto the screw-top threads. The first stage of filtration is a hollow fiber membrane microbiological filter that filters to 0.2 microns and removes 99.999999%of waterborne bacteria and 99.999% of waterborne protozoan parasites from up to 500 gallons (2,000 liters) of water. A replaceable, activated carbon capsule serves as the 2nd stage of filtration, which improves taste, removes odor and reduces organic chemical matter (pesticides, herbicides, VOCs). LifeStraw Flex filter exceeds the NSF-42 standard for chlorine reduction and NSF 53 standard for reduction of lead and other heavy metals for up to 25 gallons (100 liters). System includes a 2-stage filter, collapsible soft touch water bottle and backwash syringe. Measures 4.7 x 1 x 1 inches and weighs 1.7 ounces. For each LifeStraw purchased, one child in a developing community receives safe drinking water for an entire school year.

From the brand

Previous page
  2. Guinea Worm

    From a simple straw

    LifeStraw began as a simple mesh filter to help eradicate Guinea worm disease by removing the parasite from drinking water.

  3. Your purchase has impact

    LifeStraw gives back

    For every product purchased, a school child in need receives safe water for a year.

  4. LifeStraw Peak Solo Water Filter

    Outdoor advanced filtration

    Ultralight and designed with every occasion in mind. Our filter protects against bacteria, parasites, microplastics, and more.

  5. Outdoors
    Travel
    Home
    Emergency

    Filtration for all occasions

  6. What problem are we solving?

    LifeStraw believes safe water is a human right. We make our water filters to the highest standards, so you can safely drink at home, while traveling, and on all your adventures

    What makes our products unique?

    For every product purchased, a child in need receives a year of safe water through LifeStraw’s Give Back program. To date, over 9 million children have received a year of safe water.

    What do LifeStraw water filters remove?

    LifeStraw’s water filters remove a variety of contaminants, including bacteria, parasites, microplastics, and in certain cases, viruses.

Next page

From the manufacturer

lifestraw flex

LifeStraw Flex is a powerful multi-use filter that also reduces lead and heavy metals

squeeze

daily

safe water

camping

Next level protection

Gives you peace of mind when abroad. LifeStraw Flex removes bacteria and parasites (including Salmonella, E-coli, Giardia), chemicals and heavy metals (lead). Proven, reliable and effective, LifeStraw products are the perfect accessory for international travel.

Versatile

The LifeStraw Flex can be used in 5 ways – as a personal straw filter, with the included soft bottle, as an in-line filter with most hydration packs, with a gravity system, or simply attached to most disposable water bottles.

Compact and ultralight

Weighing only 3.15 oz, you won’t even know it’s there. Until you get thirsty.

Long lifetime

The microbiological filter lasts 500 gallons (more than 1.5 years of drinking water). And the replaceable carbon filter lasts 25 gallons (more than 3 months of drinking water).

The LifeStraw Flex can be used in many different ways

lifestraw

lifestraw squeeze bottle

hydration bladder

plastic bottle

Use as a straw

Can be used as a straw to drink directly from water sources.

Use with collapsible bottle

This kit includes the collapsible bottle.

Use a hydration bladder

Fits most standard size hydration bladders.

Use with regular plastic bottles

Screws on most plastic bottles.

impact, giving back, doing good, social good
LifeStraw Flex LifeStraw Go LifeStraw LifeStraw Universal LifeStraw Mission
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Customer Reviews
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Price — — — — —
Ideal for Everyday use, Hiking, Emergency preparedness, Travel Everyday use, Hiking, Emergency preparedness, Travel Trail running, Hiking, Emergency preparedness, Travel Everyday use, Hiking, Emergency preparedness, Travel Camping, Emergency preparedness
Removes bacteria and parasites ✓ ✓ ✓ ✓ ✓
Reduces chemicals ✓ ✓ - ✓ -
Removes viruses - - - - ✓
Removes heavy metals ✓ - - - -
Filter capacity 2000 Liters for microbiological filter, 100 Liters for carbon capsule 4000 Liters for microbiological filter, 100 Liters for carbon capsule 4000 Liters 4000 Liters for microbiological filter, 100 Liters for carbon capsule 18,000 Liters
Replaceable filters available ✓ ✓ - ✓ -

What's in the box

  • Water filter

    • Looking for specific info?

    Customer reviews

    4.5 out of 5 stars
    4.5 out of 5
    2,960 global ratings
    Simple and Easy Solution for the Quick Clogging
    5 Stars
    Simple and Easy Solution for the Quick Clogging
    The filter worked amazing with an easy and simple modification. We filtered about 12L of water using our camelbaks in about 20minutes. We did NOT have any clogging issue. I work on small engines and reading the reviews about how easily this Lifestraw clogs, I decided to use a John Deere all plastic fuel filter as a "pre-filter". I put together a 4 stage whole house filter. So, applied the same concept. The part number for the John Deere fuel filter is #AM116304. You just cut another 5/16 (inner diameter - ID) line and add it BEFORE the Lifestraw. Also, the Lifestraw takes about 10minutes to prime after it gets wet. So, once you get the filters completely saturated, wait about 10minutes before you can expect to suck the water out of it (if you're using it straight from your water reservoir pouch).
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    Top reviews from the United States

    Tom Thompson
    5.0 out of 5 stars It works anywhere
    Reviewed in the United States on August 14, 2022
    Style: FlexPattern Name: Filter SystemVerified Purchase
    People do not realize that when war or anything that’s stops electric power and tap water stops flowing in their houses. Stores will run out of water and food in a disaster. I have two 55-gallon rain barrels and a pond. This item will let you drink that water without boiling it. I grew up in the 1940s most homes and places did not have indoor plumbing. You had to get water from a spring or water well. You can not go without water very long. If you drink any bad water, you will get sick and most times die. Oh, bythe way. their cell phones will not work.
    6 people found this helpful
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    Marz
    5.0 out of 5 stars Peeeerfect for travel!!
    Reviewed in the United States on January 18, 2022
    Style: FlexPattern Name: Filter SystemVerified Purchase
    This product is a must have for any kind of travelling. I used it on a trip to the Caribbean and just refilled with tap water the entire trip. Pass through TSA without hassle and fill up at any water fountain/lounge. Super lightweight. Save $$ on buying large quantities of water or heavy bottles. Bottle material flexiblity is both a pro and a con. Pro because it fits into your bag by adapting its shape and you can roll it up and tuck it away when not in use. Con because sometimes you just want it to stand up, but that is the least. Sometimes the straw suction wouldnt work and I eventually figured out that I had to blow really hard into it and "dislodge"?? whatever caused the clog, to be able to get water. Slightly inconvenient, but the pros far outweigh this. I am absolutely glad I made the purchase. I think I will get the pitcher for my home.
    10 people found this helpful
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    Amazon Customer
    4.0 out of 5 stars Nice product
    Reviewed in the United States on June 15, 2023
    Style: FlexPattern Name: Filter SystemVerified Purchase
    Seems hefty, thick material. Very convenient for long hikes. Just wish it was available in 1L size.
    Helpful
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    fezzik
    5.0 out of 5 stars Safety First - Drink as much as you like
    Reviewed in the United States on November 16, 2020
    Style: FlexPattern Name: Filter SystemVerified Purchase
    I purchased the LifeStraw flex in preparation for a recent trip to rural TN/NC. Had a 26.2 mile run/hike on the Appalachian trail. Didnt want to carry a large hydration bladder, so got the flex.

    Pros:
    - super light weight
    - takes up very little space in any pack
    - decent volume capacity in bottle
    - great price
    - saw many, many lifestraw products in use on the AT. So they are clearly trusted.
    - flexibility in how to use the straw

    Cons:
    - when squeezing water out of bottle, to refill other people bottles, this can be a challenge.

    Its a prefect device to fit this need. Since we didnt want to share drinking out of the same bottle, that is why we choose to fill and refill the lifestraw bottle, and sequeeze the filtered water into our own bottles. It works, and it takes time as well. At least for me, you have to squeeze pretty hard (perhaps to hard)
    Customer image
    fezzik
    5.0 out of 5 stars Safety First - Drink as much as you like
    Reviewed in the United States on November 16, 2020
    I purchased the LifeStraw flex in preparation for a recent trip to rural TN/NC. Had a 26.2 mile run/hike on the Appalachian trail. Didnt want to carry a large hydration bladder, so got the flex.

    Pros:
    - super light weight
    - takes up very little space in any pack
    - decent volume capacity in bottle
    - great price
    - saw many, many lifestraw products in use on the AT. So they are clearly trusted.
    - flexibility in how to use the straw

    Cons:
    - when squeezing water out of bottle, to refill other people bottles, this can be a challenge.

    Its a prefect device to fit this need. Since we didnt want to share drinking out of the same bottle, that is why we choose to fill and refill the lifestraw bottle, and sequeeze the filtered water into our own bottles. It works, and it takes time as well. At least for me, you have to squeeze pretty hard (perhaps to hard)
    Images in this review
    Customer image
    Customer image
    7 people found this helpful
    Helpful
     Report
    N. Nguyen
    5.0 out of 5 stars Simple and Easy Solution for the Quick Clogging
    Reviewed in the United States on December 7, 2021
    Style: FlexPattern Name: Filter SystemVerified Purchase
    The filter worked amazing with an easy and simple modification. We filtered about 12L of water using our camelbaks in about 20minutes. We did NOT have any clogging issue. I work on small engines and reading the reviews about how easily this Lifestraw clogs, I decided to use a John Deere all plastic fuel filter as a "pre-filter". I put together a 4 stage whole house filter. So, applied the same concept. The part number for the John Deere fuel filter is #AM116304. You just cut another 5/16 (inner diameter - ID) line and add it BEFORE the Lifestraw. Also, the Lifestraw takes about 10minutes to prime after it gets wet. So, once you get the filters completely saturated, wait about 10minutes before you can expect to suck the water out of it (if you're using it straight from your water reservoir pouch).
    Customer image
    N. Nguyen
    5.0 out of 5 stars Simple and Easy Solution for the Quick Clogging
    Reviewed in the United States on December 7, 2021
    The filter worked amazing with an easy and simple modification. We filtered about 12L of water using our camelbaks in about 20minutes. We did NOT have any clogging issue. I work on small engines and reading the reviews about how easily this Lifestraw clogs, I decided to use a John Deere all plastic fuel filter as a "pre-filter". I put together a 4 stage whole house filter. So, applied the same concept. The part number for the John Deere fuel filter is #AM116304. You just cut another 5/16 (inner diameter - ID) line and add it BEFORE the Lifestraw. Also, the Lifestraw takes about 10minutes to prime after it gets wet. So, once you get the filters completely saturated, wait about 10minutes before you can expect to suck the water out of it (if you're using it straight from your water reservoir pouch).
    Images in this review
    Customer image Customer image Customer image
    Customer imageCustomer imageCustomer image
    16 people found this helpful
    Helpful
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    roguecop55
    5.0 out of 5 stars The perfect hiker/camper container and filter.
    Reviewed in the United States on April 12, 2021
    Style: FlexPattern Name: Filter SystemVerified Purchase
    This is the PERFECT combination of a water container/bottle and filter. After all, LifeStraw is the leader in emergency, portable water filters, but who wants to have to stick their face in that little puddle or stream to get a drink thru the straw all the time. With this little accessory you just fill up the collapsible bottle, screw on the filter and cap and you have clean filtered water without laying on the ground. And it's so lightweight that packing it empty is no problem at all. Takes up no room at all in your pack and weighs NOTHING. I bought 2, one for me AND the wife.
    2 people found this helpful
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    Allison R
    5.0 out of 5 stars Works great!
    Reviewed in the United States on July 18, 2019
    Style: FlexPattern Name: Filter SystemVerified Purchase
    I used this as a back up when going to a country where it is not advised to drink the tap water. Bottled water was available, but this gave me peace of mind for a back up. And I did end up needing it. When I tried it at home it made my tap water taste different (less taste basically). And when I tried it overseas it made the water drinkable with I was not feeling well and could not leave the hotel to buy bottled water. But I did have to carry the included syringe to get the water moving through the filter again. Overall a great and useful product.
    Helpful
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    Lee
    3.0 out of 5 stars They both leak
    Reviewed in the United States on March 14, 2020
    Style: FlexPattern Name: Filter SystemVerified Purchase
    I received my first life straw and like a lot of people already said, it leaks where the straw screws into the bag. I contacted the company and they sent me another one. 3 stars for that but it still leaks in the same place ( design flaw) but anyways I am using the included syringe to suck the water through the straw and then fill the bottles and dog dish. We camp all the time and even though the water is drinkable I like to filter it more. Can you squeeze the bag and get water. NO, it leaks and will leak in your backpack too but you can work around it if you want to.
    Helpful
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    Top reviews from other countries

    Translate all reviews to English
    Alexandre Pavy
    5.0 out of 5 stars Perfect
    Reviewed in Canada on August 9, 2023
    Style: FlexPattern Name: Filter SystemVerified Purchase
    Went 3 weeks in alaska backcountry with that one. It's strong, reliable, and does exactly what i needed. You can even fill your camelback with it if you are patient enough. Never leaked, easy to clean since you can dismantle every part.

    10/10 I recommended it to all my friend who were hiking with me and they will all go for one like that
    One person found this helpful
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    Chris Michael
    1.0 out of 5 stars Waste of money
    Reviewed in the United Kingdom on May 7, 2022
    Style: FlexPattern Name: Filter SystemVerified Purchase
    I am a patient man, and I've tried to give this bottle a chance. Even tried to fix it's defects, but my patience has reached its limit.

    First and foremost a bottle's function is to securely hold liquid; this fails at the first hurdle. I've filled it numerous times to take hiking with me for the day, only to find when I need a drink that is has leaked all over my bag. So not only am I left without safe drinking water, but my stuff is soaked and I am dehydrated for the rest of the day.

    I was recommended lifestraw by a friend as the best on the market for water filters. For the price I hoped so, and invested in one, knowing I was going to be in the jungles of Central and South America for 8 months.

    Now I don't have safe drinking water when most needed, nor can I return it because I'm in the jungle. So I'm left with an expensive piece of leaky rubber taking unnecessary space in my bag until I can stick the straw directly in a river.

    Cheers lifestraw
    2 people found this helpful
     Report
    me
    4.0 out of 5 stars suction capacity too little
    Reviewed in Germany on May 28, 2021
    Style: FlexPattern Name: Filter SystemVerified Purchase
    cons:
    · suction capacity way too little, my lips really hurt ≈1 week in
    · not very tight cap, once slipped off and watered my entire backpack :(
    One person found this helpful
     Report
    Gerardo
    5.0 out of 5 stars Excelente producto
    Reviewed in Mexico on April 27, 2019
    Style: FlexPattern Name: Filter SystemVerified Purchase
    Amo este producto en especial en esos viajes de pesca en rios y lagos evito andar cargando botellas de agua
    2 people found this helpful
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    Diego Sánchez
    1.0 out of 5 stars Un mal producto
    Reviewed in Spain on September 24, 2019
    Style: FlexPattern Name: Filter SystemVerified Purchase
    Inicialmente tenía mucha ilusión porque he comprado 4 diferentes productos de la marca y todos son muy buenos, pero este no se ha terminado de diseñar bien. En primer lugar el sistema se bloquea, por eso tiene una jeringuilla para desbloquearlo cada tanto. Además, pese a que creí que sería super resistente por ser de plastico, a la primera caida se re rompio la parte externa. Lo pude usar 3 días y fue una completa decepción.
    Report