Grayl

The natural water I tested the bottles in already looked relatively clean, but when I poured a bit from the Geopress water purification bottle, I was shocked at how crystal-clear it looked. Although I guess I shouldn’t have been surprised, as Grayl’s heavy-duty filtering and water purification system is designed to filter out protozoa, chemicals, particulates (like dirt and sand), heavy metals and bacteria and viruses.

The Geopress water purifier is made of BPA-free polypropylene, a durable type of plastic. The wide base diameter of the water purifier gives it a sturdy feel, and it’s apparently designed to withstand 10-foot drops onto concrete while it’s full of water. Without a doubt, the Geopress is the best filtered water bottle to keep you hydrated with pure water on a backpacking trip due to its intense filtering mechanism and durability. 

This Grayl bottle also offers relatively easy clean-up, an important factor if you’re using natural water. I really liked that the opening of the Geopress water filter bottle is wide enough to fit ice cubes and my entire hand into it, meaning I could actually get to the bottom of the bottle with a sponge. Just make sure to thoroughly dry the filter bottle before storing it: If you store the water purifier while it’s wet, the inner portion and outer portions suction together and it’s then difficult to pull the two pieces apart.