Chill-Its 5156 Low Profile Hydration Pack, 3 L, Black. The Chill-Its 5156 Low-Profile Hydration Pack provides on-the-go hydration provides on-the-go hydration with premium features such as accessory storage and padding for all-day convenience and comfort. The 3-liter bladder features a wide DualCap for easy n3.0 L hydration bladder provides instant access to water.Rugged 600D water-resistant ripstop polyester pack for protection from the elements.High-quality thermoplastic to withstand wear and tear, no plastic taste or smell.Antimicrobial bite valve with cover protects against contaminants for clean, safe hydration.Lightweight and low-profile with padded straps for all-day wear.Vented straps and back improve airflow.61 mm cap inside 80 mm cap for easy no-spill filling with water or ice.Zippered top closure secures bladder inside pack while keeping dirt and debris out.Zippered compartment with headphone port, six d-rings and daisy chain webbing.Insulated pack and tube keeps water cool in the heat.