I love this thing-a-ma-jig. As Dick Vitale always say,"Awesome Baby". I got tired of carrying a hand held 24 oz. bottle (i'm not gonna mention what brand) while running the hills or stairs, just felt uneasy like wearing a heart monitor chest strap, uncomfortable. I've never wore a hydration backpack before because of the bouncing of the water pack and the strap around your body. This is different because it sits high up on your back (makes it easy to reach the bottle) and there's only the shoulder strap and the strap under your armpits. I keep my energy gels in the shoulder strap pockets, my ipod and mobile phone in the storage pack & my electrolytes in the bottle. I'm gonna try and run a tube from the bottle to a mouth valve and use a clip to attach the tube to the shoulder strap of an even easier way to take a sip while running. Thanks Orange Mud.