Choose by operating need
Sawyer Squeeze
Weight, simplicity, and repeatable freshwater microfiltration matter more than virus treatment or household batch volume.
Official specificationsLifeStraw Peak Series Gravity Purifier
A household or group needs an 8-liter gravity purifier with a published virus-reduction claim.
Official specificationsGRAYL GeoPress 24 oz
One person needs portable, fast, virus-rated treatment in a bottle format and accepts cartridge replacement.
Official specificationsSide-by-side official specifications
| Model | Type | Volume | Virus claim | Published service life |
|---|---|---|---|---|
| Sawyer Squeeze | 0.1-micron microfilter | Pouch / bottle / gravity | Not listed | Maintain by backwashing; lifetime limited warranty |
| LifeStraw Peak Gravity Purifier | 0.02-micron ultrafilter purifier | 8-liter gravity bag | 99.99% | Up to 18,000 liters |
| GRAYL GeoPress | Press purifier + carbon | 24 oz per press | 99.99% | 350 cycles / 65 gallons |
The tradeoffs that matter
Throughput
A household needs liters per hour and clean storage; an individual moving on foot may care more about treatment at the source.
Failure mode
Hollow-fiber systems need correct cleaning and freeze protection after use. Press systems need replacement cartridges. Every option needs a backup.
Threat coverage
A virus-reduction claim is meaningful, but no portable system should be treated as universal protection from industrial or radiological contamination.
Cross-contamination
Dirty bags, bottle exteriors, threads, hands, and caps can recontaminate treated water. The workflow matters as much as the device.
Verify the exact model before purchase
Official pages establish the specification claims. Purchase links are separate and do not change placement.
Sawyer Squeeze
Best fit: Compact backup filtration for one person and clear freshwater sources.
Hard limit: Sawyer lists bacteria and protozoa removal, not virus or dissolved-chemical removal.
- Treatment
- 0.1-micron hollow-fiber microfilter
- Volume style
- Squeeze pouch, bottle, inline, or gravity
- Maintenance
- Backwash and protect from freezing after use
LifeStraw Peak Series Gravity Purifier
Best fit: High-volume gravity treatment when a verified virus-reduction claim matters.
Hard limit: Heavier and more expensive than a basic microfilter; it still does not make chemically contaminated water universally safe.
- Treatment
- 0.02-micron ultrafilter purifier
- Bag capacity
- 8 liters
- Published flow / life
- 30 L/hr; up to 18,000 liters
GRAYL GeoPress 24 oz
Best fit: Portable virus-rated treatment for travel, evacuation, and individual use.
Hard limit: Small batch size and a replaceable cartridge; GRAYL says to avoid industrial spills, high lead, mercury, nuclear contamination, and toxic algae.
- Treatment
- Electroadsorption plus activated carbon
- Batch / weight
- 24 oz; 15.9 oz empty
- Published cartridge life
- 350 cycles / 65 gallons / 250 liters
Official model pages
Guidance and specifications change. Follow the current local notice, official instructions, and exact model manual.