Fill your hydration pack reservoir directly from your screw on/off filter without removing it from your backpack with the Sawyer Fast Fill Adapter (hydration pack and filter sold separately). Filter Material: 0.1 Micron Absolute Hollow Fiber Membrane Longevity: Up to 500 gallons/day Height: 10.25 inches Width: 16.5 inches Length: 10.5 inches Weight: 5.4 ounces Full Product Description Fill your hydration pack reservoir directly from your screw on/off filter without removing it from your backpack with the Sawyer Fast Fill Adapter (hydration pack and filter sold separately). This handy Sawyer "hack" makes refilling hassle free. Adapters attach directly to the drinking tube on most hydration reservoirs. Designed for use with industry standard 1/4-inch inner diameter tubing, it's compatible with the Sawyer Squeeze Filters (models SP129, SP131, SP181, SP182, and SP137) and Sawyer MINI Filter (model SP128 and other colors). Kit Includes 1 Fast Fill Adapter Features & Specs Height: 5 inches Width: 1.5 inches Length: 4 inches Weight: 0.9 ounces