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The Ultimate Guide to the Best Water Purifiers for Travelers

If you’re at all concerned about the state of your planet and how much garbage is floating around in our oceans, do your part and carry one of the best water purifiers for travelers when you hit the road.

water purfier for travelers Lifestraw kit

If you want to be a responsible traveler, the first step is one of the easiest: get a travel water filter. Here’s another incentive: it’s good for your budget in the long run.

If you are buying bottled water all the time as you travel around the world, you are a walking environmental disaster. Single-use plastic is clogging our rivers, filling our oceans, and overloading our landfills. “Oh, but they get recycled,” you may be thinking, but you’d be thinking wrong. That’s just a rationalization to make yourself feel better because in fact, only a tiny percentage of single-use plastic bottles get a second life in a travel jacket or a park bench. Most of them just end up on the ground or thrown in with the regular trash, to stick around until our planet dies.

In the USA the recycling percentage was a lame 23% before China stopped taking most of it because of a trade spat. It’s surely less than 20% now. So imagine what it is when you pop the top and guzzle a liter of water in Nepal, or India, or Peru. Wave goodbye to that bottle as it floats out to sea and ends up here:

bottled water garbage on beach

Even if you’re torn by the convenience of it all, look at it as a math problem. If you spend $2 a day on bottled water on a year-long trip, that’s $730. Most of the travel water purifier options highlighted here are under $100. Even if you throw in spare filters and a name-brand water bottle that’s insulated, you’re still saving enough money to pay for weeks of lodging or to travel longer. Here are the best travel water purifiers you can pack.

SteriPEN UV Water Purifier

This is the hands-down travel water filter favorite, the simplest to use of the various water purifiers and the most effective in a wide variety of situations. The water has to be clear, so no muddy rivers, but it works great for water from a tap or a stream. For me it’s been the best travel water purifier I’ve used in my years of traveling. 

In short, the UV light from one of these SteriPENs kills everything in the water in about a minute and you can drink it right away. I’ve used one of these in around 20 different countries now and have not gotten sick even once. From Mexico to Peru, Kyrgyzstan to Cambodia, any place where the tap water is dicey I’ve packed one of these and avoided buying tons of plastic. My wife and daughter have used it and their stomachs have been fine too.

Steripen - one of the best water purifiers for travelers

Depending on the model, a SteriPEN for clearly filtered water will set you back $60 to $90, but a recharge lasts for a long time and it doesn’t take up much space. You can see much more detail at this SteriPEN review post with all the options.


This long-running Swiss water filtration brand has evolved into the big leader in this world, buying SteriPEN a few years ago and Micropur purification tablets before that. They were mainly focused on the serious backcountry hikers and emergency workers willing to pay $200+ for a pump purifier through most of their history, but now Katadyn has something for all price points.

They make several sub-$100 pump portable water purifiers, including the Hiker Microfilter ($55-$70) and the BeFree collapsible filter bottle. If you’re a backpacker couple, you might want to check out their 6-liter Gravity solutions. These hold 10 liters and hang from a hook or branch, so you can keep filling up your bottles for a while.

Lifestraw Travel Water Filter

When Lifestraw first came onto the scene as a company, their product seemed to do the impossible. You could stick their straw into a nasty muddy stream, suck water out, and feel secure that your gut would be fine. Here’s one of their marketing guys demonstrating it at a conference I was attending:

Lifestraw water filter gets rid of every pathogen and dirt tooCrazy, right? The hiking crowd rightfully went nuts over this Lifestraw, seeing it as a lifeline when drinking water from a stream where there might be animals pooping upstream or who knows what kinds of pathogens in the water. Many years later, it’s clear that the original works and they have a sleeker-looking steel version too. This is one of the best portable water purifiers for travel if you’re going to be doing backcountry hiking.

You probably want something with more volume for normal travels though, and they know that, so more products followed to filter more volume and also serve the more casual traveler. They’ve got a $45 water bottle with a built-in water filter called Lifestraw Go, a one-gallon hanging gravity kit, and the cool universal kit pictured at the top that I’ve been trying out myself lately. That’s my regular go-to Avex bottle with the cap changed out for their filter.

I love this $35 kit because it doesn’t make you give up your favorite bottle or change your habits just to have a travel water filter on hand. You can connect it to any standard wide-mouth or medium-mouth water bottle opening used by the major companies. In other words, this will clip into your existing bottle from Kleen Kanteen, Camelbak, Avex, Hydro Flask, and a zillion more, including the Nalgene ones that aren’t big enough to stick a fist into.

The kit comes with two openings for two sizes, plus a screw-on cover to keep it from leaking. You need that because this is a suction filtration system. It doesn’t take all that much sucking power, thankfully, but the downside of that is you can have a leaky bottle when turned upside down without the cap.

The advantage of this kind of water purifier system, compared to a SteriPEN using UV light, is that it will filter out nasties instead of just killing them. While in practice this hasn’t mattered in my experience with tap water, the extra filtering could be helpful for water from other sources, especially if you have a weak stomach. This should make you feel better: “Removes 99.999999% of waterborne bacteria (>LOG 8 reduction), including E-Coli. Removes 99.999% of waterborne protozoan parasites (>LOG 5 reduction), including Giardia & Cryptosporidium.”

CrazyCap Built-in Purifier

Speaking of UV light, that’s what the CrazyCap uses, but in an innovative design where the purifier is built into the cap itself. So even if you wear out your banged-up bottle, you can just move the cap to any Swell-type bottle and this cap will fit right on. If you buy both the cap and bottle from them on their website, it’s around $70, ,which you can earn back quickly. You can also buy it on Amazon. They say the product will last long enough to eliminate the need for 500,000 plastic water bottles.

This design makes it handier than a SteriPEN because you only have one thing to carry around. When it’s time to recharge, you just plug the cap and adapter into the wall and a little while later you’re good to go for another week or two of purification. See how it and some of these others work in this video:

Grayl Ultralight Filters

The way Grayl bottles work is you fill up the outer cup, push down the inner cup with a filter, and then drink what’s in the middle. This water bottle with filter works like a dream with tap water, in theory just fine with water from a stream, getting you filtered water in just 15 seconds. There’s now a larger version that takes longer but has a higher capacity. 

Grayl water purifier

My experience has been good, but not always great. I’ve used a Grayl bottle in several countries and been relatively happy with it. I say “relatively” because the filter seems to get clogged up rather quickly if the water is not super clear and when that happens, you need to have the strength of a weightlifter to push the inner section down and get to your water. I ran into this multiple times in rivers where the water was reasonably clear, but there was a fair bit of silt in it. I managed to rinse mine out when back at a safe water source, but eventually you’re looking at a $25 replacement filter each time.

If you will mostly be purifying tap water or clear stream water though, as you would with a UV wand, a Grayl Geopress will do you just fine and will potentially offer more protection because of the filtration. I used one for a week in Peru and had no issues. Their bottles come in multiple colors and retail for $70 to $90 at REI, so it’s a good investment. Get the larger Geopress one if you’re a heavy water chugger or will be really active though: the original only holds 10.9 ounces.

Other Water Filters for Travelers

I don’t want this post to go on for days, but there are plenty of options for travel water purifiers beyond what I’ve listed here. I just know these brands and trust them. I’ve tried a few knock-off brands over the years that have come and gone, often for a good reason because of some major fatal flaw. I’m usually willing to go with a cheap option, but when it comes to luggage or my health, I get more strict on the standards. The cheaper ones tend to break faster too. 

I will say, however, I’ve heard good things from others about Sawyer bottles and Water to Go. These all work with a similar principle, putting a filter between what goes in the bottle and what goes in your mouth. I like solutions like this except for one essential time: when you need to brush your teeth. Then it’s best to have a pump, SteriPEN, or Grayl so you can pour instead of suck.

There are other travel water filter bottles that combine technology, working as a pump and a bottle, like this Lifesaver Liberty one that filters up to 2,000 liters before you need to replace the cartridge.

How about you? Which have you found to be the best portable water purifiers for travel?

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Tamryn Liu

Monday 7th of June 2021

Great article. I was actually considering the Grayl Geoporess due to all the good reviews but I think i'll have to reconsider or research more after reading up on your experience. Thanks so much for sharing.

Tim Leffel

Tuesday 15th of June 2021

It's a good product and I use it when hiking. It takes a little muscle to push down, but your filter is also your bottle.

C thompson

Friday 4th of June 2021

Great article. Thanks!!

Gipsy Dean

Friday 14th of May 2021

If they would put a deposit on these single use water bottles in third world countries it would reduce them just being thrown in the trash and/or give the street people who search thru garbage cans something to make a few pesos on. Here in Mexico and in most of the latin countries you cannot get a refund on a bottle deposit unless you have the reciept for it. They can only collect aluminum cans that they can sell.


Sunday 16th of May 2021

Moderorama, Extra, and Oxxo stores don't usually ask for a receipt. I have brought bottles back to their stores a year later. (Owned by the beer companies.)

Greg Hartzell

Saturday 20th of October 2018

This is good information, Tim. And timely for us as we are headed to Puerto Escondido for a month in a few days and then off to Panama for around 4-6 months. I will look to purchase one of these solutions for my wife and I in the next few days. Thanks!