Low Weight Per Liter

Every ounce carried for days gets argued over before the trip starts.

Small Packed Footprint

A hip-belt pocket or a side pouch is where this rides on the trail.

Drink Straight From Source

Skipping the transfer step saves minutes at every creek crossing.

No Batteries Required

A dead cell miles from a trailhead leaves a purifier as dead weight.

Scoops From Shallow Water

Late-season sources are often an inch deep between two rocks.