National Geographic’s Topographic Map Guide booklets are printed on "Backcountry Tough" waterproof

and removing 100% of microplastics

Weight: Full Size: 1

cross-cuts

Material(s) Stainless steel

Grayl GeoPress® Replacement Purifier Cartridge camp & hike accessories National Geographic’s Topographic Map GuideReplacement purifier cartridges for the GEOPRESS are designed to last 350 cycles (65 gal. 250L). Lifespan will decline when purifying water with high levels of silt, sediment or tannins. Cartridge press time increases towards the end of the cartridge lifespan; when press time reaches 25 30 seconds, the cartridge should be replaced. Cartridge continues to protect, even as press time increases. Removes waterborne pathogens (viruses, bacteria, protozoan