Ideal for longer expeditions like ultra-trails, the SOFT FLASK XA FILTER filters bacteria and protozoa from natural water sources, so you can drink easily and safely without needing to carrying huge volumes of water. Shrinking as you drink to limit water bounce, the flask lets you know exactly how much you have left. Features a wide 42-mm cap. FEATURES & FABRICS - HYDRATION: Meets US FDA testing protocol - SUSTAINABILITY: 100% BPA & PVC free - HYDRATION: High-flow valve - HYDRATION: Large 42mm opening - HYDRATION: TPU & RF welded seams - HYDRATION: Filter included - HYDRATION: Use to refill with clean water. - SUSTAINABILITY: PFC-free Body 40% Thermoplastic Polyurethane, 21% Acrylonitrile-Butadiene-Styrene, 21% Polyoxymethylene, 11% Polysulfone, 7% Silicon Article ref. LC1915800