Sawyer Products Fast Fill Adapters for Hydration Packs Adapter set allows you to quickly fill your hydration bladder with clean water without removing it from your pack Compatible with both the Sawyer Products Squeeze Filter (also known as PointOne) and Sawyer MINI water filtration systems Attach the Sawyer water filter to the adapters and squeeze water into your reservoir via the drinking tube Designed for use with industry standard 1/4-inch inner diameter tubing