How does a coffee press work? A sieve/mesh pushes through the murky liquid to collect the grounds on one side, and leave brewed coffee on the other side. does the same thing too, but with a much more advanced mesh filter… and it doesn’t prepare coffee, it purifies water. Giving you a bottle-full of pure, drinkable water in just 15 seconds, the Grayl is a heaven-sent for not just outdoors, but for international travel too. The Grayl Ultralight’s filter is designed to remove 99.999% of bacteria, viruses, and protozoan cysts from your water, while even filtering out fine particles, and heavy metals with just a simple push of the filter, not just making your water healthy, but taste refreshing too. The Grayl Ultralight comes built with two compartments, a frosted outer tumbler (great to grip while also giving you the illusion of chilled water), which you can fill with anything from river water, to rainwater, to even regular tap water, and an inner tumbler with a proprietary filter attached to its base. The Grayl Ultralight even comes with its own handy air-tight lid so you can carry that water around with you, whether it’s out in the wild, or even in an unknown city/country! Designer: