Range overview · Not a tested review

GRAYL water filter bottles: GeoPress and UltraPress, side by side.

Four press-style bottles, two sizes, two materials. Here is what the manufacturer says, how the range differs, and where its limits sit.

Manufacturer specifications checked November 2, 2026. Hydrology University has not independently tested these bottles or verified their performance or certification. Our methodology.

The four variants

Image: GRAYL (manufacturer)
GeoPress
The larger-capacity standard model.
Capacity
24 oz / 710 ml
Weight
450 g
Advertised press time
8 seconds
Rated cartridge life
350 cycles / 250 L
Image: GRAYL (manufacturer)
UltraPress
The smallest and lightest of the four.
Capacity
16.9 oz / 500 ml
Weight
354 g
Advertised press time
10 seconds
Rated cartridge life
300 cycles / 150 L
Image: GRAYL (manufacturer)
GeoPress Ti
GeoPress capacity with a titanium outer cup; heavier than standard.
Capacity
24 oz / 710 ml
Weight
570 g
Advertised press time
8 seconds
Rated cartridge life
350 cycles / 250 L
Image: GRAYL (manufacturer)
UltraPress Ti
UltraPress capacity with a titanium outer cup; heavier than standard.
Capacity
16.9 oz / 500 ml
Weight
400 g
Advertised press time
10 seconds
Rated cartridge life
300 cycles / 150 L

How a press bottle works

GRAYL describes its cartridge as combining electroadsorption with activated carbon. We report that description; we have not measured it.

01
Fill
Fill the outer cup with water from your source.
02
Press
Push the inner element, which holds the cartridge, down through the outer cup.
03
Drink
Drink from the inner element once the press is complete.

Specifications compared

Manufacturer figures, checked November 2, 2026. Scroll sideways on smaller screens.

Specification	GeoPress	UltraPress	GeoPress Ti	UltraPress Ti
Capacity	24 oz / 710 ml	16.9 oz / 500 ml	24 oz / 710 ml	16.9 oz / 500 ml
Weight	450 g	354 g	570 g	400 g
Advertised press time	8 seconds	10 seconds	8 seconds	10 seconds
Rated cartridge life	350 cycles / 250 L	300 cycles / 150 L	350 cycles / 250 L	300 cycles / 150 L
Construction	Polypropylene body	Polypropylene body	Titanium outer cup, plus plastic and silicone parts	Titanium outer cup, plus plastic and silicone parts

Choosing between them

GeoPress or UltraPress

GeoPress holds more per press (710 ml) with a longer rated cartridge life. UltraPress is smaller and lighter (500 ml, 354 g in standard form). Pick by how much water you need per fill and how much weight you want to carry.

Standard or Ti

The Ti versions add a titanium outer cup, which the manufacturer allows for cooking under the official manual. They are heavier than the standard bottles and keep the same rated press time and cartridge life, so treat Ti as an outer-cup versatility choice, not a performance upgrade. They still include plastic and silicone parts and are not plastic-free.

Heat safety

If you use a Ti outer cup over heat, follow the official manual for your model. Never heat the assembled bottle or the cartridge.

Cartridge replacement

GRAYL advises replacing the cartridge when a press takes around 25 seconds, or 3 years after first use. GeoPress and UltraPress cartridges are different; follow the manual for your exact model.

Limitations

Freshwater only
Not for salty or brackish water.
Some sources are out of scope
GRAYL says the bottles are not designed for water affected by industrial disasters, high lead or mercury, or toxic algae. The manufacturer advises choosing another source.
Ratings are manufacturer figures
Cartridge life and press time are advertised numbers. Actual results depend on source water and conditions; colder water can slow the press.
Not a guarantee for unknown water
Manufacturer claims do not guarantee the safety of any particular source. Follow local water advisories.
Lab-tested is not the same as certified
Statements that a product was tested to a standard should not be read as NSF or other certification. We make no certification claim here.

Sources

Manufacturer pages, checked November 2, 2026. Product images: GRAYL.