Geopress Replacement Cartridge Sizes:OS Stay Warm: With 200 grams

Stay Warm: With 200 grams of KEEN

Includes 50 feet of 3/8 inch line

Lightweight O Matter™ frame material with Square O metal icon and front rivet accents

Perfect fit | Self-adjusting nose bridge | Adjustable split strap

Geopress Replacement Cartridge Sizes:OS Stay Warm: With 200 gramsBoost your GeoPress! GeoPress cartridges were redesigned in April 2023 with a new "core" and "flow channels" to accommodate a One Way Valve for use with electrolytes, drink mixes and or other flavored liquids. Note: the GeoPress(R) One Way Valve ships pre installed in every GeoPress Bottle. Replacement purifier cartridges for the GeoPress are designed to last 350 cycles (65 gal. 250L). Lifespan will decline when purifying water with high levels of