Turn your Sawyer screw on/off filter into an inline filtration system for your hydration pack with this simple accessory. This system is compatible with the Sawyer Squeeze Filter and the PointOne Filter. With this inline hydration system you can fill your reservoir with dirty water and drink safe, clean water from the tube. When you don't need to filter water, just unscrew the connections from the filter and screw them together to reconnect the tube- remember to thoroughly clean a dirty reservoir before drinking from it without the Sawyer filter. With this system drinking clean water from your hydration pack has never been simpler and it is perfect for backpackers, campers, hikers and hunters. Note: Hydration pack not included.FeaturesQuick and easy to useDrink directly from water source