Here's what other sites are saying:
Think of water filtration in a whole new way with the quick and convenient gravity-powered Sawyer 2-liter water filter system.
Sawyer Water Treatment System - 2L - New - The filtration process is practically hands-free: just hang the system from a tree or any source off the ground and watch gravity do all the work. In as little as 1.5 minutes you will have 2L of safe, clean drinking water. When flow becomes slow or clogged, the included faucet adapter can be used to backwash the filter by forcing clean water back through your filter with clean water from a faucet.
- Massey's Outfitters
Sawyer Water Filtration System 4 Liter
Sawyer Complete Water Filtration System 2 Liter
Sawyer Complete Water Filtration System 4 Liter
$140 - $148
Sawyer Complete Water Filtration System 8 Liter
Sawyer Squeeze Filter System
$25 - $59
Katadyn Gravity Camp 6L
$77 - $89
Sawyer All in One Filter
MSR Autoflow Gravity Filter