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 no-spill filling with water or ice. Both the pack and tube are insulated to keep water cool in the heat. The antimicrobial bite valve with cover protects against contaminants for clean all-day drinking. The lightweight and low-profile design is comfortable for wear both on and off the worksite. The pack itself is made with durable 600D water-resistant ripstop polyester for protection in rough conditions. For all-day comfort and breathability, it features foam padding on the shoulder straps and venting on both the straps and back. A zippered top keeps the bladder secure while also preventing dirt and debris from getting into the pack.