My wife and I like the nalgene bottles by Camelback. The silicone top mouthpiece is pretty leakproof, but I would lose the straw that comes with it. I'd rather just tilt it back than try to suck on it while I'm trying to catch my breath. It also has a loop for a carabiner clip. I put a clip on it, but don't clip it to my clothes, it knocks around too much. Instead, the carabiner makes a great loop handle so I can carry it by the caribiner and still keep my hands and arms relaxed during the run. The weight of the liquid is enough not to make it jostle around too much.