An innovative, ultra-light, efficient system for fast-and-light day hikes and long treks, the PackFlask puts hydration right where you want it. Securely attach it to your pack harness for hands-free use. A stretch mesh pouch secures the bottle and - without the flask - carries a phone, snacks, or map. The bottle is light, designed to ride comfortably, and collapses when empty for easy packing. Its leakproof self-sealing nozzle delivers high-flow hydration, and a dust cover keeps it clean.