Water Filters & Purifiers
Portable filters and purifiers treat water from an untreated source so it can be drunk. A filter removes bacteria and protozoa; a purifier also removes viruses.
Specifications are manufacturer-published figures compiled in August 2026. We have not independently tested this equipment. A dash means the figure could not be confirmed with the manufacturer.
Choose by brand
6 brands make water filters & purifiers. Each brand page lists only that brand's models.
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LifeStraw
Swiss-founded; hollow-fibre filters and bottles across a wide price range.
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Sawyer
US maker of inline hollow-fibre filters with very high rated lifetimes.
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GRAYL
US maker of press-style purifier bottles that treat viruses as well as bacteria.
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Katadyn
Swiss maker; ceramic pump filters and the BeFree squeeze range.
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Platypus
US brand (Cascade Designs) making squeeze and gravity systems.
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MSR
US brand (Cascade Designs) making pump filters and the Guardian purifier.
Every model compared
Pore size is the largest particle the element lets through — smaller is stricter. Rated life is the volume the manufacturer certifies before the element is replaced, not the volume at which it stops working.
| Model | Format | Rated pore size | Removes | Rated life | Weight |
|---|---|---|---|---|---|
| LifeStraw Personal Water Filter | Straw | 0.2 µm | Bacteria, parasites, microplastics | 4,000 L | 46 g |
| LifeStraw Peak Series Squeeze 1 L | Squeeze bottle | 0.2 µm | Bacteria, parasites, microplastics | 2,000 L | 103 g |
| LifeStraw Go Series Bottle 1 L | Bottle | 0.2 µm + carbon | Bacteria, parasites, chlorine, odour | 4,000 L membrane / 100 L carbon | 268 g |
| LifeStraw Peak Series Gravity 8 L | Gravity bag | 0.2 µm | Bacteria, parasites, microplastics | 2,000 L | 450 g |
| LifeStraw Family 1.0 | Gravity, high volume | 0.02 µm | Bacteria, parasites, viruses | 18,000 L | 1.4 kg |
| Sawyer Squeeze (SP129) | Squeeze / inline | 0.1 µm | Bacteria, parasites | Manufacturer-rated 100,000 US gal | 85 g |
| Sawyer MINI (SP128) | Squeeze / inline | 0.1 µm | Bacteria, parasites | Manufacturer-rated 100,000 US gal | 57 g |
| Sawyer Micro Squeeze (SP2129) | Squeeze / inline | 0.1 µm | Bacteria, parasites | Manufacturer-rated 100,000 US gal | 62 g |
| Sawyer Select S3 | Purifier bottle | — | Bacteria, parasites, viruses, chemicals | 400 L | 340 g |
| GRAYL GeoPress 24 oz | Press purifier | — | Viruses, bacteria, parasites, chemicals, heavy metals | 250 L per cartridge | 439 g |
| GRAYL UltraPress 16.9 oz | Press purifier | — | Viruses, bacteria, parasites, chemicals, heavy metals | 300 L per cartridge | 354 g |
| GRAYL UltraPress Titanium | Press purifier, titanium | — | Viruses, bacteria, parasites, chemicals, heavy metals | 300 L per cartridge | 490 g |
| Katadyn BeFree 1.0 L | Squeeze bottle | 0.1 µm | Bacteria, parasites | 1,000 L | 63 g |
| Katadyn Hiker Pro | Pump | 0.2 µm | Bacteria, parasites | 1,150 L | 310 g |
| Katadyn Pocket | Pump, ceramic | 0.2 µm | Bacteria, parasites | 50,000 L | 550 g |
| Katadyn Vario | Pump, ceramic + carbon | 0.2 µm | Bacteria, parasites | 2,000 L | 430 g |
| Platypus QuickDraw 1 L | Squeeze | 0.2 µm | Bacteria, parasites | 1,000 L | 80 g |
| Platypus GravityWorks 4 L | Gravity | 0.2 µm | Bacteria, parasites | 1,500 L | 320 g |
| MSR Guardian Purifier | Pump purifier | 0.02 µm | Viruses, bacteria, parasites | 10,000 L | 490 g |
| MSR MiniWorks EX | Pump, ceramic + carbon | 0.2 µm | Bacteria, parasites | 2,000 L | 456 g |
| MSR TrailShot | Pocket pump | 0.2 µm | Bacteria, parasites | 2,000 L | 142 g |
| MSR Thru-Link | Inline | 0.2 µm | Bacteria, parasites | 1,500 L | 74 g |
A dash means the figure could not be confirmed with the manufacturer. Compiled August 2026.
Common questions
If there is one thing that all hikers and outdoor enthusiasts have in common, it’s that they all agree you should never blindly drink out of a natural water source. That’s because the unfiltered water, although fresh and natural, contains harmful bacteria and waterborne parasites that would likely go undetected by taste alone. With a filter water bottle, you can enjoy safe, clean drinking water anytime, anywhere, and especially during emergencies.
In the following guide, we reviewed 10 of the best filter water bottles on the market today. Read on to find out our top pick for use during emergencies!
Filter Water Bottle FAQ
What Is a Filter Water Bottle?
A filter water bottle is designed for filtering fresh water source into safe drinking water.
What Does a Filter Water Bottle Do?
A filter water bottle uses a built-in filtration system to remove bacteria, parasites, and other contaminants found in freshwater sources.
How Does a Filter Water Bottle Work?
A filter water bottle uses a built-in filtration system to remove contaminants from freshwater sources. Different brands and models will differ in their filtration method, fill method, and drinking method. Some models go even further to remove radiological contaminants from water.
Where Can You Buy a Filter Water Bottle?
You can buy a filter water bottle at your local outdoor equipment retailer or online at Amazon.com.