Category: Grayl

  • Grayl Geopress Water Purifier

    The old rule of threes is still (roughly) accurate: three minutes without air, three days without water, three weeks without food. But! Some people are particularly freakish/motivated/genetically gifted, as in 22 minutes without air, 18 days without water and 74 days without food (thank you Human beings are generally pretty good at avoiding airless […]