An emergency medical technician by trade, Bicycle enthusiast Michael Eidson came up with a solution on the fly: he filled an IV bag with water, slipped it into a white tube sock (yes, an actual tube sock), and stuffed the whole contraption into the back of his bike jersey. He then threw the hose over his shoulder and clamped it shut with a clothespin. Hands-free hydration was born. And CamelBak was created to pursue it.