Great for backpacking treks or long hikes, the Hydration Pack Fast Fill Adapters allow you to fill your hydration pack reservoir directly from your Sawyer screw on/off water filter without removing it from your backpack. The adapters attach directly to the 1/4-inch drinking tube on most hydration reservoirs (hydration pack and filter sold separately). This set of Hydration Pack Fast Fill Adapters is compatible with the Point ONE, Point ONE All-in-One, and MINI water filtration systems.