Press out the impurities and keep it movin'. When temps are high and supplies are low, we find the nearest water source and Press On. It's crazy easy: fill the outer cup, insert the filter-laden bottle and 'French press' the two together for instant drinkability. The unrivaled design lets us sip clear H20 from the top while keeping the dirty and diseased bits separate. Effective on all seven continents, the filter protects from global waterborne pathogens (virus, bacteria, protozoan cysts), pesticides, chemicals, heavy metals, and even microplastics. By GRAYL.