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#8 on this list
GeoPress 24 oz
Grayl
Press-filter purifier removing viruses. The pick for international treks and questionable water.
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#9 on this list
Traveller 1 L
Sigg
Swiss extruded aluminum with a baked liner. Dents instead of shattering and weighs almost nothing.
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Specs side by side
| Spec | GeoPress 24 oz | Traveller 1 L |
|---|---|---|
| Capacity | 24 fl oz (710 ml) | 1 Liter |
| Purification Type | Press-filter (viruses, bacteria, protozoa) | — |
| Filter Life | 350 cycles (65 gal / 250 L) | — |
| Weight | 15.9 oz (450 g) | Approximately 5.5 oz (156 g) |
| Flow Rate | Roughly 8 sec / 24 oz | — |
| Materials | Food-grade silicone, ABS plastic, polypropylene | — |
| Material | — | Extruded Aluminum |
| Liner | — | Baked-on, Food-safe |
| Origin | — | Switzerland |
| Cap Type | — | Screw Top |
What our reviewers liked and didn't
GeoPress 24 oz
- Removes viruses, bacteria, protozoa, chemicals, and microplastics
- Fast purification speed (approx. 8 seconds per 24 oz)
- No pumping, sucking, or waiting for chemicals to act
- Improves taste and odor of water significantly
- Rugged construction withstands outdoor use
- Heavier and bulkier than simple filters or chemical treatments
- Requires significant downward force to press, especially when new
- Cannot purify very silty or muddy water effectively without pre-filtering
- Filter replacement costs add up over time
Traveller 1 L
- Extremely lightweight for its durability class
- Aluminum dents instead of shattering or cracking
- Internal liner prevents metallic taste and corrosion
- BPA-free construction throughout
- Highly reusable and long-lasting design
- No insulation properties; water temperature changes quickly
- Narrow mouth can be challenging for cleaning or ice cubes
- Exterior can scratch or chip over time
- Dents are permanent cosmetic changes
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