The Chill-Its 5052 Replacement Hydration Pack Bladder is designed for clean, on-the-go hydration and is fully compatible Chill-Its 5160 Hydration Pack (sold separately). Constructed from high-quality PE+EVA material, this 3.0L // 3000mL is built to withstand repeated use. The bladder features a wide fill port with a built-in handle for quick, mess-free filling with water or ice, while an internal baffle helps reduce sloshing to keep the load stable and balanced. Clear tubing con