INSULATED TUBE: Insulates in cold weather and protects in tough conditions. FREEZING RESISTANT: Designed for a wide range of cold weather activities. PLUG-N-PLAY: Universal connector with ¼ diameter and quick release system. HIGH FLOW VALVE: Lightweight and quick flowing with our Phaster bite valve. Includes dust cover. 100% BPA & PVC FREE: No weird taste, no unnecessary and harmful chemicals. COMPATIBILITY: Designed exclusively for Plug-N-Play systems found on HydraPak-manufactured hydration reservoirs.