Hydration meets protection. CamelBak built this pack for enduro courses where riders descend 4,000 feet in under 20 minutes and where crashes are inevitable. The K.U.D.U.'s back protector insert, the Impact ProtectorTM, absorbs over 94% of impact in a crash. And while most back protectors are“one-hit wonders" this one can withstand multiple impacts. The Impact ProtectorTM is made of flexible, lightweight foam that moves with your body, so you'll get the protection you need without feeling like a tank.