Grayl Geopress One-Way Valve Color:Clear this fleece is perfect for

this fleece is perfect for a range of adventures

Foam type: Molded closed cell

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2% Elastane

Grayl Geopress One-Way Valve Color:Clear this fleece is perfect forGive your GeoPress a boost! Overview A feature no other drink thru filter bottle can deliver, the GeoPress One Way Valve allows electrolytes and sport drink mixes to be added to clean purified water without compromising the integrity of the filter. Also allows a GeoPress to be used with a variety of flavored drinks such as juice, bubbly water, mocktails and cocktails. Only compatible with 2nd Generation cartridges first sold in April 2023 that include