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

Dysentery and more

Made from Ultra-Sil™ 30D CORDURA® Nylon fabric with an eVent® fabric base

water-resistant medical bag

The Micro Squeeze 0

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