Hiking/Camping

The 7 Best Backpacking Water Filters & Purifiers For 2018

Drink Water Safely With These Filters & Purifiers

In order to safely and effectively travel in the backcountry it’s critical to avoid illness. One potential source of infection is through water borne pathogens and there exist many methods of water purification.

One of these methods is a backpacking water filter – a physical filtration system whereby pathogens are filtered out of water using mechanical water pressure and a filter.

There are many methods of effective water purification such as boiling, chemical, UV, or physical filtration. Which method you ultimately choose is a function of many considerations.

For more of my top gear recommendations, have a look through these popular Outside Pursuits guide links: Backpacking Firestarters, Backpacking Stoves, GPS Hiking Watches.

So what is the best backpacking water filter?

Quick Answer: The 7 Best Backpacking and Hiking Water Filters

  1. LifeStraw Mission Water Purifier
  2. Katadyn Pocket Microfilter
  3. Katadyn Hiker Microfilter Water Filter
  4. MSR MiniWorks EX Microfilter Water Filter
  5. Sawyer Products MINI Water Filtration System
  6. SteriPen Adventurer Opti UV Water Purifier
  7. Aquimira Chemical Treatment

Here is a feature overview of my top 3 overall picks. Our guide and comparison table of the top rated backpacking water filters will help you choose the right one for you.

Best Backpacking Water Filters

 LifeStraw Mission Gravity PurifierKatadyn Pocket Water FilterKatadyn Hiker Microfilter
editors choice
Membrane:0.2 Micron absolute hollow fiber membrane inline filter 0.2 microns ceramic element filter0.2 micron glass fiber filter
Method:Gravity Fed, with 5L and 12L water bagHand Pump - 1 quart (1 liter)/minute Hand Pump - 1 quart (1 liter)/minute
Rated For:Will filter and purify 18,000 liters of water (4,755 gallons)Replaceable cartridge up to 13,000 gallons (50,000 liters)Replaceable cartridge up to 750 liters

Backpacking Water Filter Reviews

#1 LifeStraw Mission Gravity-Fed Water Purifier

LifeStraw Mission High-Volume Gravity-Fed Water Purifier

There are so many good things to say about this water filter system that it’s hard to know where to start…

Lifestraw is probably one of the most recognized name in water filtration and the LifeStraw Mission Water Purifier is one of the best options for backpackers and campers.

Ease of use and simplicity are top selling factors. Simple, fill a bag with water, attach the filter and the hollow membrane water filter gives you water that has 99.9999% of bacteria, protozoa and viruses removed from the water.

Viola! Clean clear water, no chemicals or anything else needed.

Gravity filters and pressure filters have been around for ages and the Lifestraw Mission takes the technology to a new level.

To clean it out you just use the integrate backwash bulb to clean out particulates and debris so you can use it again.

The filter is rated for up almost 5,000 gallons of filtered water but it is pretty doubtful you’re likely to test that – that’s a whole lot of water!

LifeStraw Mission High-Volume Gravity-Fed Water Purifier Review
LifeStraw Mission High-Volume Gravity-Fed Water Purifier

These filters have exploded in popularity and you’re guaranteed to find hundreds of rave reviews and other users on the trail the next time you’re out backpacking and since it can filter a lot of water it’s also one of the best camping water filters.

It’s available in two sizes, a 5 liter and a 12 liter for when you have a group of people.


#2 Katadyn Pocket Microfilter

Despite the name, this filter won’t be fitting into your pocket readily. It’s actually quite a large and relatively heavy filter.

So why is it on the list?

This filter made the list because I have worked with it in various backpacking expedition programs where the filter has seen years of heavy use and still functions well.

katadyn-pocket-water-filterThis is a rugged and durable water filter system which will clean water sources thoroughly and effectively. The filter can be broken down completely into its constituent parts for thorough cleaning and sanitation.

All metal and rugged plastic construction mean that there’s virtually zero chance of destroying or breaking anything.

The most common injury I’ve seen on these filters is a bent pump arm – which can easily be broken down and replaced with a quick call to Katadyn for replacement parts.

What’s the biggest drawback?

Replacement filters are well over $100 but the ceramic filter inside this pump is one of the better filter units on the market. The ceramic filter element can be cleaned using a brillo or Scotch Brite pad and will last a very long time.

Eventually, however, the ceramic filter will wear down with successive cleanings and need to be replaced. Definitely not one of the cheapest options but one of the best portable water filters on the market.


#3 Katadyn Hiker Microfilter Water Filter

The first water filter I ever purchased and used was a Katadyn Hiker Pro (effectively the same filter) and it lasted a few years before the output nipple broke off when I attempted to remove the hose.

As far as I can tell, this was a one-off incident and the filter by and large is quite reliable.katadyn-hiker-microfilter

That being said, the filter is entirely plastic and more fragile than, perhaps, other comparable filters.

One major upside is the low initial cost to buy as well as widely available and inexpensive replacement filters.

This portable water purifier does a good job while avoiding excessive clogging and cleans easily.

To clean the filter, you just need to unscrew the filter element, rinse it out, and set it to dry (or bleach it if needed). A single circlip holds the pump arm on to the body of the filter and you’ll need to disassemble, clean, and lube it after each trip.

If you can find the filter on sale or at a discount, it’s definitely one of the best backpacking water purifiers.


#4 MSR MiniWorks EX Microfilter Water Filter

Another ceramic element filter, this time from MSR. I’ve used this filter before and had mixed results – it’s one of the ones that tends to clog quickly.

However, if you’re using it correctly and filtering water that’s not too full of sediment then it’s a great water filtration system. This one operates using a lever arm instead of a direct pump handle in a vertical fashion.

One cool feature is that the filter can screw directly on to a Nalgene wide mouth bottle or a Dromedary (Drom) water bag for easy filling.

Video: Overview of the MSR Miniworks.

This is a feature I fail to use, however, as my water bottle (Platy Plus Bottles) don’t fit the adapter. If you’re a heavy Nalgene die-hard, then this might be a good feature for you.

It’s pretty easy to disassemble and clean and, once again, you’ll have to scrub the ceramic filter on occasion to clean off the filtered sediment and debris.

At a much lower price and with more affordable replacement cartridges than the Katadyn Pocket, this filter might be an economical choice. Be aware, however, that it is a less durable all plastic construction but being very lightweight it might be the best hiking water filter.


#5 Sawyer Products Mini Water Filter

When you need a drop dead simple and effective water filter for your backpacking trips the Sawyer Mini is perfect. It’s been used on the trail by hikers for years and is a trusted solution.

When you’re ready for a drink just fill the Sawyer squeeze pouch with water from your source and screw it on the filter and either drink directly from it or squeeze the water out into a water bottle.

Doesn’t get any easier.

The filter is rated for 100,000 gallons and removes 99.99999% of harmful bacteria like salmonella and E.coli. The Sawyer Mini will work with water that has a lot of sediment but it will clog up much faster and require backwashing the filter.

The Mini weighs only a few ounces so its perfect for ultralight backpackers but is not just for the backcountry.

Use it anywhere that you don’t trust the water. It will also work with hydration packs as an inline filter, you just need an optional adapter.

The Sawyer Products PointOne Squeeze Water Filter System comes with a bucket and faucet adapters for filtering large quantities of water.


#6 SteriPen Adventurer Opti UV Water Purifier

The SteriPen is not a water filtration system like the others it’s a water purifier using ultraviolet light to kill harmful microorganisms like e.coli, viruses and protozoa. One big difference is the SteriPen will kill virus’s where as a filter like the Sawyer mini cannot because a virus will slip through the pores.

It’s a simple device to use, just pour the water to be treated into a container, turn on the SteriPen and stir in the water for less than a minute until the light goes off.

You may have to use the pre-filter to get clear water because the SteriPen’s ultraviolet light will not be effective with cloudy water. You would probably want to do that anyway, who want to drink cloudy water!

The SteriPen is good for 8,000 uses, probably a lifetime for most people and uses two disposable CR123 batteries go for 100 water treatments.

Ideal not only for hikers and backpacking trips, it’s perfect for travel as well. Going to Mexico? Take the SteriPen before you drink the water!

It’s only 3.6 ounces and comes with a neopene case case that fits through your belt loop. They even included a flashlight on the pen for use at night!

The SteriPen should be in your outdoor gear kit and doesn’t leave any after taste like chlorine dioxide does for chemical water treatment discussed next.


#7 Aquamira Chemical Treatment

Aquamira - Chlorine Dioxide Water Treatment

While this article is all about physical filters for water purification, I’m going to take a minute to address chemical purification. Various forms of chemical purification exist from Iodine, AquaMira, and bleach.

Chemical purification does nothing to remove physical sediment so if the water is dirty, you’ll be drinking the dirt.

However, chemical purification using chlorine dioxide, when used properly, will kill all pathogens in your water. Advantages include price (for some forms), utility, weight, and bulk.

Chemical purification options can be quite affordable and, while Aquamira water treatment drops will eventually add up to exceed the cost of some filters, the benefits can outweigh. Personally, after much research, I have chosen to migrate to unscented pure bleach for purification and use this method exclusively (for about the last 3 years).

When done properly bleach is safe to drink (due to dilution) and effective at killing pathogens.

My motivation?

I can pay less than $5 for a gallon of bleach which will purify hundreds of thousands of gallons of water, transfer it into a one ounce dropper bottle weighing mere grams, and have enough purification for weeks on the trail at a time.

Iodine tabs and Aquamira water treatment drops are perfectly safe, commercially manufactured and tested, chemical treatment methods and I used AquaMira for years before switching to bleach. Highly recommend them!


Backpacking Water Filter Comparison Table

Water Filter TypeTreatment MethodFlow RateLifetime UseRating
LifeStraw Mission High-Volume Gravity-Fed Water PurifierGravity FedHollow membrane water purifier9-12 liters per hour4,755 gallons4.3 / 5.0
Katadyn Pocket FilterPumpSilver impregnated ceramic element1 quart per minute13,000 gallons4.5 / 5.0
Katadyn Hiker FilterPumpMicron glassfiber filter with activated carbon1 quart per minute200 gallons4.3 / 5.0
MSR MiniWorks EX MicrofilterPumpCarbon/ceramic element1 quart per minute500 gallons4.2 / 5.0
Sawyer Products Mini Water FilterSqueezeMembrane inline filter 1 quart per minute100,000 gallons4.6 / 5.0
SteriPen Adventurer UV Water PurifierPurifierUltraviolet light16 oz per minute8,000 uses3.7 / 5.0
Aquamira Chemical TreatmentChemicalChlorine DioxideN/A30 gallons 4.7 / 5.0

How to Choose the Best Backpacking Water Filter

Best Camping Water Filter

Size and Weight

For backpacking size and weight definitely matter but they’re not always the end of the story. All else being equal, an intelligent backpacker would choose the smallest and lightest of all options when picking a piece of outdoor gear.

Some of the lightest and smallest options for purification are not filters at all – chemical purification is one of the most compact forms of water purification and UV pens can be quite compact.

Type of Water Filters

Were going to take a look at the 3 methods of water filtering.

Straw

Just like the name you suck the backcountry water through a straw that has a filter. These filters have the advantage of being light and drop dead simple to use.

The drawback?

You cannot filter and large quantity of water to store for later use and as a result are only useable when you are near a water source.

Pump Filters

Here we can now filter large quantities of water use a mechanical pump to force the water through a filter into a storage container. The advantage is pump filters can quickly filter water but they do require some effort to work the pump!

Gravity

Instead of working a pump we take advantage of gravity to direct the water through a filter into your storage container. They have the advantage of ease of use. Just hang the water pouch from a branch and let gravity do the work!

The disadvantage is they are slower since there is no mechanical force pushing the water through the filter. And of course you need somewhere to hang the pouch from!

Replacement Parts

Mechanical filters all have a filtering element which must eventually be replaced. In some cases, the filter and unit are disposable and must be replaced entirely when the filter has met the end of its life span.

In the case of UV purification, batteries must be recharged or replaced. For chemical water treatment, the chemicals themselves will eventually run out.

Filter Pore Size

Pore size, for mechanical water filters, refers to the size of the holes in the filter through which water is squeezed. The idea is to have a pore size smaller than the pathogens you’re filtering yet large enough to permit the passage of just water.

Before purchasing a mechanical filter be sure to review the pore size, usually measured in microns, against the size of the pathogen you wish to filter out. Not all filters can filter out every type of pathogen – surprisingly.

Best Hiking Water Filter

Water Considerations

If you’re heading in to areas of stagnant and dirty backcountry water or areas where suspended sediment is extremely high, you’ll have a lot of trouble with mechanical filters.

One of the biggest issue is that the filter will quickly get clogged with dirt, sediment, or suspended particles in the water which get filtered out.

I’ve had filters get clogged so quickly before (in relatively clean water) that I have to clean them after each liter of filtered water. This is a huge pain in the ass and can be a problem even when the filter is used properly. In these cases, pre-filtering the water by straining through a cloth can be helpful.

If all else fails, you may want to consider a purification method which is physically unaffected by sediment such as chemical.

Conclusion

Water purification is a broad category containing filters, chemicals, UV, and boiling among others. All of these methods, when done right, will purify your drinking water.

Filters, however, are a specific category of physical “screens” in various forms which filter out pathogens as water is forced through them.

Which type of purification and, further, which filter you choose is entirely based on your level of knowledge, risk tolerance, budget, and preferences.

Drinking unpurified water is a great way to end up very sick or contracting parasites – not that I haven’t done it myself but I advise against it!


I hope this guide was helpful for finding the best backpacking water filter to fit your needs. If you want to comment or recommend a filter I didn’t include, please use my contact form to get in touch.

Have fun and be safe out there!

Be sure to see my favorite hiking shoes, along with sleeping bags, tents and hiking backpacks.

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Casey Fielder

I am an avid outdoorsman with experience in naturalist education, outside adventure education, ski instruction, and writing. In addition to my outdoor hobbies, I’m a huge fan of punk rock. I have launched several start-ups. (or business ventures) When exploring the backcountry, I usually carry less than 10 pounds of gear. Years of experience have taught me to pack light. I enjoy sharing my experiences of backcountry education teaching and guiding through writing.

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