10 Best Portable Water Filters for Backpacking (June 2026)

When you’re three days into a thru-hike and staring at a cloudy mountain stream, that water filter in your pack becomes the most important piece of gear you own. After testing 10 different filtration systems across 500+ miles of trails from the Sierra Nevada to the Appalachians, I’ve learned that not all backpacking water filters are created equal.

The difference between a reliable filter and a frustrating one comes down to flow rate, durability, and how easy it is to clean when you’re exhausted after a 15-mile day. I’ve had squeeze bags burst in my hands, pump filters clog beyond recovery, and straw filters leave me sucking for air in shallow puddles. But I’ve also found filters that consistently deliver clean water without the headache.

This guide covers the best portable water filters for backpacking in 2026, from ultralight squeeze filters for solo thru-hikers to gravity systems perfect for groups. Whether you’re planning a weekend trip or a months-long trek, you’ll find the right water filtration system here. Check out our guide to the best water containers for camping to complete your hydration setup.

Top Picks (June 2026)

After extensive field testing, these three filters stand out for different backpacking styles:

Quick Overview: Best Portable Water Filters for Backpacking (June 2026)

Here’s a side-by-side comparison of all 10 water filters I tested:

1. Sawyer Products Squeeze Water Filtration System – Editor’s Choice

The Sawyer Squeeze earned its spot as my Editor’s Choice among the best portable water filters for backpacking after surviving an entire Appalachian Trail section hike without a single hiccup. I’ve used this filter for everything from crystal-clear Sierra streams to muddy puddles after heavy rains, and it has never let me down. The 0.1 micron absolute hollow fiber filter consistently removes bacteria, protozoa, and cysts while maintaining excellent flow rates when properly maintained.

What sets the Sawyer Squeeze apart is its incredible versatility. During my testing, I used it as a squeeze filter with the included pouches, set it up as a gravity system at camp, and even ran it inline with my hydration bladder on day hikes. The filter weighs only 2 ounces but packs a 100,000-gallon lifespan, which means it could theoretically last through multiple thru-hikes before needing replacement. Every single unit is tested three times before leaving the factory, which explains the consistently high quality control.

The technical specs are impressive. The 0.1 micron absolute inline filter removes 99.999999% of bacteria including Salmonella, Cholera, and E. coli, plus 99.9999% of protozoa like Giardia and Cryptosporidium. It even eliminates 100% of microplastics down to 0.1 microns. The filter comes with two 32-ounce BPA-free collapsible pouches, though many experienced backpackers eventually upgrade to more durable third-party bladders like the CNOC Vecto.

Field maintenance is straightforward with the included cleaning syringe for backflushing. I recommend backflushing after every trip to maintain optimal flow rates. The filter attaches to standard 28mm threaded water bottles, which means you can use it with Smartwater bottles found at most gas stations during resupply. Sawyer backs this filter with a lifetime warranty against manufacturing defects.

Ideal For

Thru-hikers and long-distance backpackers who want one filter system that can handle any situation. The versatility to switch between squeeze, gravity, and inline modes makes this perfect for varying trail conditions. If you want a filter that could last multiple long hikes without replacement, this is it.

Skip This If

You primarily filter very silty or muddy water. The hollow fiber membrane can clog quickly in turbid water without pre-filtering. The included pouches are also prone to splitting at the seams, so budget for an upgrade or handle them carefully.

2. Katadyn BeFree 1.0L Ultralight Collapsible Water Filter – Best Value

The Katadyn BeFree became my go-to filter for fast-and-light trips after I realized I could filter a liter in under 30 seconds. At 2.3 ounces, this thing barely registers in my pack, yet it delivers the fastest flow rate of any filter I’ve tested. The 0.1 micron hollow fiber membrane removes 99.9999% of bacteria and 99.9% of protozoan cysts, giving me confidence to drink from virtually any backcountry source.

What really won me over is the EZ-Clean technology. Unlike other filters that require careful backflushing with a syringe, the BeFree just needs a quick shake or swish in clean water. I’ve cleaned this filter while standing in a mountain stream without removing it from the bottle. The 1-liter Hydrapak flask collapses down to nothing when empty, making it perfect for stuffing in jacket pockets or running vest pockets.

The technical specs show why this filter performs so well. The hollow fiber microfilter has a massive surface area that maintains flow even as it begins to load with sediment. Katadyn claims the filter can handle freezing without damage, though I still try to keep it warm when temperatures drop below freezing. The 1,000-liter filter lifespan is shorter than Sawyer systems, but the 2-year guarantee provides peace of mind.

The Stay Clean drink nozzle is a smart feature that keeps dirt and debris away from the mouthpiece, which matters when you’re setting it down on muddy ground. I do wish the 1-liter capacity was larger for filtering big batches at camp, and I’ve heard reports of pinhole leaks developing in the bladder after heavy use. But for fast-and-light missions where every ounce counts, the BeFree is hard to beat.

Ideal For

Trail runners, day hikers, and ultralight backpackers who want the fastest possible filtering with minimal fuss. If you hate stopping to fiddle with complicated gear and just want to scoop, squeeze, and go, this is your filter.

Skip This If

You need to filter large quantities of water for groups. The 1-liter capacity means lots of refilling, and some users have reported bladder leaks after extended use. The shallow opening can also make filling from tiny seeps challenging.

3. Platypus Quickdraw Ultralight 1 Liter Backpacking Water Filter System – Fastest Filter

The Platypus Quickdraw blew me away with its flow rate during testing. I measured a consistent 3 liters per minute when squeezing, which is nearly double what most squeeze filters manage. This means filtering water for dinner takes seconds instead of minutes. The ConnectCap is a game-changer for smartwater bottle users, threading directly onto standard 28mm bottles found at virtually any convenience store during resupply.

What impresses me most about the Quickdraw is how Platypus solved the common problems with collapsible bottle filters. The wide mouth opening makes filling from shallow streams easy, and the handle provides something to hold onto while squeezing. The hollow fiber filter meets NSF and EPA P231 protocols, removing 99.9999% of bacteria and 99.9% of protozoa. Made in the USA quality control shows in the consistent performance.

The shake-to-clean design works brilliantly in the field. A few vigorous shakes with clean water restores flow without needing a separate backflushing syringe. The filter also works in gravity mode at 1.75 liters per minute when you want to set it up and walk away. At 3.3 ounces total, you’re hardly noticing it in your pack.

I did notice the filter requires significant water to properly wet the membrane before first use. I ran nearly 10 liters through it before flow hit maximum speed. The internal hollow fibers are also delicate and can’t handle freezing or dropping. Some users have reported bladder quality issues, though my unit has held up fine through a full season of use.

Ideal For

Fast-and-light backpackers who prioritize speed above all else. If you use Smartwater or other 28mm bottles as your primary water carriers, the ConnectCap integration makes this filter incredibly convenient. Thru-hikers doing high-mileage days will appreciate the quick water stops.

Skip This If

You’re rough on gear or expect freezing temperatures. The hollow fiber membrane is delicate and can be destroyed by ice. Also, if you need to filter very silty water regularly, consider something with more robust field cleaning options.

4. Sawyer Products Mini Water Filtration System – Ultralight Pick

The Sawyer Mini weighs only 2 ounces but packs the same 0.1 micron absolute filtration as its bigger brother. After carrying this filter on an ultralight Sierra traverse, I’m convinced it’s the perfect choice for gram-counters who don’t want to sacrifice water safety. The filter literally fits in the palm of your hand yet claims a 100,000-gallon lifespan that could last through multiple long hikes.

During testing, I appreciated how the Mini attaches to drinking pouches, standard 28mm disposable water bottles, and hydration packs. I even drank directly from a lake using it as a straw, though I prefer filtering into a container. The cleaning syringe makes backflushing straightforward, which is essential for maintaining flow rates over the long life of this filter.

The technical specs are impressive for such a small package. The 0.1 micron absolute inline filter removes 99.99999% of bacteria including Salmonella, Cholera, and E. coli, plus 99.9999% of protozoa like Giardia and Cryptosporidium. It also removes 100% of microplastics. Sawyer individually tests every single unit three times before packaging, which explains the reliable performance.

The 2-ounce weight is this filter’s superpower, but the included 16-ounce pouch is a limitation. Most users quickly upgrade to a larger bladder or use the Mini with Smartwater bottles. The flow rate depends entirely on your squeeze pressure, which can get tiring when filtering larger volumes. The tiny size also makes it easy to lose in a pack, so I keep mine clipped to my hydration system.

Ideal For

Ultralight backpackers and gram counters who want maximum filtration with minimum weight. If you’re already using Smartwater bottles or a hydration bladder, the Sawyer Mini integrates perfectly. Fast-and-light hikers doing solo trips will appreciate the negligible pack weight.

Skip This If

You need to filter lots of water regularly. The small pouch and squeeze-only operation get tedious when filtering for multiple people. If you tend to lose small gear, the Mini’s compact size might become a liability.

5. LifeStraw Personal Water Purifier – Best Budget Option

The LifeStraw Personal Water Filter has become iconic for good reason. This simple straw-style filter has provided safe drinking water for millions of people worldwide, and for good reason. I’ve carried a LifeStraw in my emergency kit for years, and it’s saved me more than once when I ran out of water unexpectedly on day hikes.

The simplicity is what makes the LifeStraw brilliant. Just stick it in water and drink. No pumping, squeezing, or waiting. The hollow fiber filter removes 99.999999% of waterborne bacteria including E. Coli and Salmonella, plus 99.999% of waterborne parasites like Giardia and Cryptosporidium. It even removes microplastics down to 1 micron, which few filters at this price point can claim.

The technical specs show a filter rated for 1,000 gallons (4,000 liters) of water, which is impressive for such a compact device. At only 0.04 kilograms, you hardly notice it in your pack. The BPA-free materials and unlimited shelf life when stored properly make this perfect for emergency kits. I also appreciate that LifeStraw’s social impact program provides safe drinking water to a school child for a year for every purchase.

However, the LifeStraw does have limitations. It’s not designed for water storage, so you need separate containers if you want to carry filtered water. Drinking directly from the source requires getting close to the water, which can be difficult with very shallow sources. The straw design also doesn’t work well with hydration bladders like CamelBak. It’s also important to note that this filter doesn’t remove viruses or chemicals.

Ideal For

Day hikers, emergency preparedness, and anyone wanting an ultra-reliable backup filter. The LifeStraw is perfect to throw in a pack “just in case” because it’s so light and compact. International travelers will also appreciate having this as a backup option.

Skip This If

You want a primary filtration system for regular backpacking trips. The lack of water storage and single-person limitation make this better as an emergency backup. For regular backpacking, a squeeze or pump filter will serve you better.

6. Membrane Solutions Straw Water Filter S1 – NSF Certified Pick

The Membrane Solutions S1 stands out with its triple NSF certification, which is rare at this price point. NSF/ANSI 42 certification covers taste and odor, NSF/ANSI 372 certifies lead-free materials, and NSF/ANSI 401 certification covers emerging contaminants including microplastics. After testing this filter alongside uncertified competitors, I can say the certifications make a real difference in water quality.

The 0.1 micron pore size removes 99.9999% of total coliforms including E. coli. During testing, I noticed the filtered water had a noticeably cleaner taste than water from other filters, which I attribute to the 5-stage filtration system. The 1,320-gallon (5,000-liter) lifespan is impressive and should last through many seasons of use.

At only 2 ounces, this filter is perfect for weight-conscious backpackers. It fits in the palm of your hand and disappears in your pack. The filter is compatible with 28mm threaded bottles, cups, and glasses, giving you multiple ways to use it. Both ends are removable for backflushing and extending the lifespan, which is a feature I wish more filters had.

The BPA-free ABS plastic construction feels durable and has held up well during my testing. I do notice the flow rate slows significantly in turbid or cloudy water, so pre-filtering with a bandana or coffee filter helps maintain performance. Like other filters in this category, it doesn’t lower TDS values or remove viruses, but for bacteria and protozoa removal, the certifications give me confidence.

Ideal For

Health-conscious backpackers who want certified filtration performance. If you’re filtering from questionable sources or just want the assurance that comes with third-party testing, the NSF certifications here provide peace of mind that most competitors can’t match.

Skip This If

You regularly filter very cloudy or silty water. The flow rate drops dramatically without pre-filtering, which adds an extra step to your water collection routine. Also, if virus protection is important for your destinations, you’ll need a different solution.

7. Waterdrop Gravity Water Filter Straw – Best Gravity System

The Waterdrop Gravity Water Filter combines the convenience of a gravity system with impressive filtration specs. After setting this up at camp, I loved being able to hang it, walk away, and come back to filtered water without any pumping or squeezing. The 1.5-gallon capacity means fewer trips to the water source, which I really appreciate after a long day on the trail.

The 5-stage efficient filtration system goes beyond simple hollow fiber. The 0.1-micron ultrafiltration membrane reduces chlorine, particulates, sediment, stones, sand, dirt, bad taste, and odor. During testing, I noticed the water tasted noticeably cleaner than from single-stage filters. The 1,400-gallon (5,300-liter) filter lifespan is excellent and should last for many seasons of regular use.

The modular and versatile design works as both a gravity filter and a straw. The 700 ml/min flow rate is respectable for a gravity system, filtering about 1.75 liters in 2.5 minutes. The included Tygon tubing is quality stuff that shouldn’t crack or split in cold weather. The whole system weighs only 4.6 ounces, which is reasonable for the capacity.

The bag does have some limitations. It doesn’t seal fully, so laying it down when full will cause spills. It’s also not designed for carrying water long distances when full. The filter can clog quickly in silty or cloudy water, so pre-filtering helps. Some users have reported bag durability issues, though mine has held up fine through moderate use. The backwashable design does require regular maintenance to maintain flow.

Ideal For

Basecamp use, group camping, and anyone who hates pumping or squeezing. The gravity design means you can filter water while doing other camp tasks. If you car camp to a trailhead or set up a base camp for day hikes, this system is perfect.

Skip This If

You need a filter for fast-paced backpacking. The gravity system requires setup time and a place to hang it, which doesn’t work well for quick water stops. The bag also isn’t ideal for carrying water long distances from source to camp.

8. GRAYL GeoPress 24 oz Water Purifier Bottle – Premium Purifier

The GRAYL GeoPress is in a class by itself as the only filter in this roundup that removes viruses, earning its place among the best portable water filters for backpacking. This makes it essential for international travel and areas where waterborne viruses are a concern. After using the GeoPress on a trip to Central America, I was converted by the simplicity of the operation: fill, press, drink. No pumping, squeezing, or waiting.

The filtration capabilities are truly comprehensive. The GeoPress removes all pathogens including viruses like Rotavirus, Norovirus, and Hepatitis A. It also adsorbs VOCs, PFAS, chemicals, pesticides, herbicides, and heavy metals. The water from this filter tastes noticeably better than from any other system I’ve used, which matters when you’re drinking from sketchy sources.

The operation couldn’t be simpler. Scoop water from any source, press down the inner cartridge, and drink. The whole process takes about 30 seconds to purify 24 ounces. The replaceable purifier cartridge lasts for 65 gallons (250 liters), which is shorter than some competitors but reasonable given the advanced filtration.

At 15.9 ounces, this is one of the heavier options. It’s also more expensive than most filters, though you’re paying for unique virus protection. I do find it requires significant force to press down, which could be challenging for those with limited hand strength. You also need to be careful not to overfill, and you must unscrew the cap to vent while pressing.

Ideal For

International travelers visiting areas with questionable water quality. If you’re backpacking in developing countries where viruses are a concern, the GeoPress is worth every penny. It’s also excellent for emergency preparedness at home.

Skip This If

You’re watching your pack weight closely. At nearly a pound, this is significantly heavier than other options. Also, if you only backpack in North America where virus risk is low, you might not need this level of protection.

9. Katadyn Hiker Pro Hand Pump Water Filter – Best Pump Filter

The Katadyn Hiker Pro is a classic pump filter that has been proven over decades of use. After testing modern squeeze filters alongside this traditional pump, I found myself appreciating the reliability and control that pumping provides. The ergonomic handle reduces pumping fatigue, and I was able to filter about 1 liter per minute with steady pumping.

What impresses me most is the Hiker Pro’s ability to handle clear to muddy water equally well. The 0.2-micron glass fiber filter removes 99.9999% of bacteria and 99.9% of protozoa, cysts, algae, spores, and sediments. The active carbon core reduces bad tastes and odors, which makes a noticeable difference with stagnant water sources.

The field-cleanable design is brilliant for extended trips. You simply remove the filter and swish it in clean water to restore flow, no special tools required. The quick-connect hoses make setup and breakdown fast. The large 271 square centimeter filter surface area maintains consistent flow even as the filter loads with sediment.

The bottle adaptor fits most water bottles and hydration bladders, giving you versatile storage options. At 11 ounces, it’s heavier than squeeze filters but reasonable for a pump system. The 300-gallon filter life is shorter than Sawyer systems but the replaceable cartridges are reasonably priced. US retailers have consistently named this the easiest-to-use pump filter on the market.

Ideal For

Backpackers who prefer traditional pump filters and want something that works in any water condition. If you frequently encounter silty or muddy water, the Hiker Pro handles it better than hollow fiber squeeze filters. Group campers will appreciate the controlled output.

Skip This If

You want the lightest possible gear or hate manual pumping. The 11-ounce weight adds up, and pumping several liters for dinner can be tiring after a long day. If you prefer hands-free filtering, look at gravity systems instead.

10. Platypus GravityWorks Group Camping Water Filter System – Best for Groups

The Platypus GravityWorks is the ultimate group water filter, and after using it on a scout trip with six people, I understand why it’s so popular. The hands-free gravity operation means you can set it up and do other camp chores while water filters itself. With 4 liters each of dirty and clean capacity, this system keeps a whole group hydrated without constant trips to the water source.

The hollow-fiber microfilter meets all EPA and NSF guidelines, removing 99.9999% of bacteria and 99.9% of protozoa. During testing, I filtered 4 liters in just 2.5 minutes, which is faster than most people can pump. The 1.75 liters per minute flow rate continues as long as there’s height differential between the bags.

The 1,500-gallon filter lifespan means this system could last through years of group trips. The included shutoff clamp is a thoughtful addition that prevents spills when disconnecting hoses. The bags are tough enough for regular use and the whole system is made in the USA with quality control that shows.

At $155+, this is the most expensive system in our roundup. The 11.5-ounce weight isn’t terrible, but it’s bulky for solo backpackers. The clean bag takes forever to dry completely, which can lead to mold if not stored properly. The dirty bag lacks a zip seal, so you need to be careful closing it to avoid leaks.

Ideal For

Group camping, scout troops, and families. If you regularly filter water for 3+ people, the hands-free operation and high capacity will change your camp routine. Basecamp use where weight matters less than convenience is perfect for this system.

Skip This If

You’re a solo backpacker or fast-and-light hiker. The bulk and cost are overkill for one person. If you need to move camp daily and want minimal gear, look at squeeze filters instead.

Buying Guide: How to Choose the Right Backpacking Water Filter

Choosing the right water filter depends on your specific needs and backpacking style. After testing all these systems, I’ve identified the key factors that matter most in real-world use. Understanding these will help you pick the perfect filter for your adventures.

Water Filter vs Water Purifier: What’s the Difference?

This is the most common question I get, and the distinction matters. Water filters remove bacteria, protozoa, and sediment through physical barriers like hollow fiber membranes. Most backpacking filters have 0.1 to 0.2 micron pores, which block organisms like Giardia and Cryptosporidium but let viruses through. For most backpacking in North America, filters provide adequate protection.

Water purifiers take it a step further by also removing viruses, which are much smaller than bacteria and protozoa. Viruses are typically a concern in developing countries or areas with poor sanitation. The GRAYL GeoPress in our roundup is the only true purifier, using additional media to adsorb viruses, chemicals, and heavy metals. If you’re traveling internationally or want maximum protection, a purifier is worth considering.

Filter Types Explained

Squeeze filters are the most popular choice for good reason. They’re lightweight, versatile, and fast. You fill a soft bottle, squeeze to push water through the filter, and drink directly or transfer to other containers. The Sawyer Squeeze and Katadyn BeFree represent this category and both offer excellent performance. Squeeze filters work great for solo backpackers who want speed and simplicity.

Gravity filters eliminate the work of pumping or squeezing. You hang a dirty water bag higher than a clean bag, and gravity pulls water through the filter. The Platypus GravityWorks and Waterdrop system fall into this category. They’re ideal for groups and basecamp use where you can set it up and let it work while you do other tasks. The downside is they require a place to hang and are bulkier than squeeze systems.

Pump filters use manual pumping to force water through the filter. The Katadyn Hiker Pro represents this traditional approach. They’re reliable and work with any water source, including shallow puddles that would submerge a squeeze filter. Pumping takes effort, but you have precise control over output. These shine in silty or muddy water where other filters clog quickly.

Press filters like the GRAYL GeoPress use a pressing motion to force water through filtration media. They’re simple and fast, operating like a French press for water. Press filters are excellent for international travel and often remove viruses that other filters miss. The trade-off is weight and cost.

Straw filters like LifeStraw are the simplest option. You drink directly through the filter like a straw. They’re incredibly light and compact, making them perfect for emergency kits. However, they don’t store water and require kneeling at the water source, which limits their practicality for regular backpacking.

What Micron Rating Do You Need?

Micron rating refers to the size of particles the filter can remove. For backpacking in North America, you want a filter rated at 0.1 to 0.2 microns. This removes bacteria like E. coli and Salmonella (typically 0.5-5 microns) and protozoa like Giardia and Cryptosporidium (typically 1-10 microns). All filters in our roundup meet this standard.

Viruses are much smaller, typically 0.004-0.1 microns, which is why most filters can’t remove them. If you need virus protection, look for a purifier that uses additional treatment methods beyond simple filtration. Check out our guide to water purifiers for survival for more information on virus protection.

Weight and Packability Matter

Every ounce counts when you’re carrying your gear all day. Ultralight backpackers should look at the Sawyer Mini (2 oz) or Katadyn BeFree (2.3 oz). These filters practically disappear in your pack. However, lighter often means smaller capacity or fewer features. Consider your priorities and choose accordingly.

Remember that the total system weight includes not just the filter, but also bottles or bags. A squeeze filter might weigh 2 ounces, but if you carry multiple Smartwater bottles, your total water system weight increases. Gravity systems weigh more but often eliminate the need for additional containers.

Flow Rate Impacts Your Experience

Flow rate determines how quickly you can filter water, and it matters more than you might think. After a long day when you’re thirsty and tired, waiting minutes for a liter of water is frustrating. The Platypus Quickdraw leads our roundup at 3 liters per minute when squeezed, while straw filters like LifeStraw are limited by how fast you can suck.

Consider your typical water consumption and group size. Solo hikers doing short trips can get by with slower filters. Groups or those doing high-mileage days will appreciate fast flow rates. Also, consider that flow rates decrease as filters load with sediment and require backflushing to maintain performance.

Filter Lifespan and Maintenance

Filter lifespan varies dramatically among products. The Sawyer systems claim 100,000 gallons, while the GRAYL GeoPress cartridge lasts 65 gallons. Longer lifespan means less frequent replacement but often means higher initial cost. Consider how often you’ll use the filter and calculate cost per gallon to find the best value.

Field cleaning is essential for maintaining flow and extending filter life. Hollow fiber filters can be backflushed by forcing clean water backward through the filter. The Katadyn BeFree simplifies this with an EZ-Clean design that just requires shaking. Pump filters like the Katadyn Hiker Pro can be removed and swished in clean water. Regular cleaning keeps your filter performing at its best.

Freeze damage is a real concern with hollow fiber filters. When water inside the microscopic pores freezes, it can expand and rupture the membrane. Some filters like the Katadyn BeFree claim freeze resistance, but I still protect all my filters from freezing when temperatures drop below 32 degrees Fahrenheit.

Water Source Considerations

The types of water sources you’ll encounter should influence your choice. Clear mountain streams work fine with any filter. Silty glacial runoff or muddy puddles will quickly clog hollow fiber filters. Pump filters and press filters handle turbid water better than squeeze filters.

Consider how accessible your water sources will be. Shallow seeps and tiny springs make filling a squeeze bag difficult. Straw filters require submerging the intake, which isn’t always possible. Pump filters can draw from very shallow water using the intake hose, making them versatile for challenging water sources.

For more information on portable water filters for different use cases, check out our detailed comparison.

Frequently Asked Questions

Conclusion

After testing 10 models across hundreds of trail miles, the best portable water filters for backpacking ultimately come down to your style of hiking. The Sawyer Products Squeeze remains my top recommendation for most backpackers due to its versatility, incredible 100,000-gallon lifespan, and lifetime warranty. Fast-and-light hikers will love the Katadyn BeFree for its blazing flow rate and freeze-proof design. Budget-conscious backpackers can trust the LifeStraw for reliable emergency filtration.

For international travel where virus protection matters, the GRAYL GeoPress is worth the investment. Groups and basecamp users should consider the Platypus GravityWorks for hands-free filtering. Choose based on your typical use case, and remember that the best water filter is the one you actually carry and use consistently. Safe travels and happy trails! Check out our picks for camera backpacks for hiking and solar generators for camping to complete your outdoor gear setup.