This Optimist buoyancy bag offers 48 liters of flotation and is made of polyurethane-coated nylon, making it about half the weight and significantly stronger than PVC bags. Featuring a regular PVC non-return valve for easy inflation and deflation, it provides excellent protection for your boat. Ideal for reducing water in the boat after a capsize, this buoyancy bag is soft to the touch when properly inflated, ensuring safety and durability.