The MSR Quick-Connect Bottle Adapter allows you to securely connect your HyperFlow Microfilter to a wide-mouth, 32 oz. Nalgene water bottle or any other container with 63mm threaded openings. By using the Quick-Connect Bottle Adapter, you can avoid the need for a separate output hose and make the entire filtering process easy and efficient. As an added bonus, the Quick-Connect Bottle Adapter doubles as a convenient drinking spout.