The first hydration pack for mountain bikes that can be integrated in a back protector. Inspired by the same technology used in MotoGP, its exclusive semi-rigid polyethylene structure keeps it stable no matter how full, while also providing additional back protection. Its anatomical shape perfectly fits the body, making it invisible under any jersey. Humpback H20 is designed to perfectly integrate into the Rival Vest Pro back protector and to be easily removed for water refills.