Made of pliable plastic, this sports bottle is easy to squeeze when sipping. It's made from polyethylene, a plastic that is manufactured without BPA. Pros: A small dial closes the bottle opening so no water leaks out when it's in your bag. Cons: The lid isn't attached, making it easier to lose. (In blue/silver, red/silver, clear/black, clear/red, clear/blue, and clear/pink; camelbak.com).