ergodyne® Chill-Its 5050B Bladder Replacement, 2 L, Blue, Ships in 1-3 Business Days (EGO13057) Eachergodyne Chill Its 5050B Bladder Replacement The Chill Its 5050B Two Liter Replacement Bladder is compatible with the 5155 Hydration Pack (sold separately). The bladder features a DualCap for easy no spill filling with water or ice, plus an insulated tube to keep water cool in the heat. For Use With: ergodyne Chill Its 5155 Hydration Packs Global Product Type: Hydration Packs Color(s): Blue Color Family: Blue Material(s): Thermoplastic Carrying