Sawyer® Inline Water Filter.
This incredible filter adapts to any hydration pack. It can be used with a camp bag to filter even larger quantities of water for a group. It can also be used with a faucet mount. Treats up to 500 gallons.
Sawyer® Inline filters (Removal Rate: 7 Log Bacteria 99.99999%, 6 Log Protozoa & Cysts 99.9999%)
This inline filter has a flow rate of 30 mL/sec from a hydration pack, 60 PSI (full city water flow) from a faucet mount, and 5 gallons every 30 minutes from a gravity bag (standard shower bag).