I bought this and was so excited to use it! Only to be disappointed, the actual mouthpiece is a bit small, and cover is difficult to keep open while drinking, the way it sits there's liquid around the mouthpiece so you feel like your dribbling. I thought i purchased a lid with a larger mouthpiece but received the exact same thing. The positives are it fits the Thirsti drink system, keeps your drink cold, carbonated, and the lock system is great.