5050B Replacement Bladder is handy when your old hydration bladder needs replacing for portable use. Filling bladder is simple and painless with the wide, dual-cap opening that prevents dreaded spills. Drink a maximum of 2 liters of refreshing water thanks to the insulated tube that cools water in the heat. One cap is small to fill with water and drink. Other cap is large to fill with ice. Safe, clean hydration is possible with the antimicrobial bite valve and cover protecting against contaminants. High-quality thermoplastic is durable and does not have that unfortunate plastic taste or smell. It is suited with the Chill-Its 5155 Hydration Pack (not included) and 5159 Hydration Cleaning Kit (not included).