There's more to this bottle than you think! It's ergonomically shaped and angled spout is for efficient, fast flowing hydration wherever you are. With a leak-proof, tethered cap that just requires a one-half turn to release and then flips out the way whilst you drink. The thread for the cap is on the inside for a comfortable lip seal which is a well thought out design feature, and the one piece tether keeps the top locked out of your way for one-handed refilling from taps and other water sources. The Camelbak Chute is BPS and BPA free and can be chucked into the top shelf of the dishwasher for easy and convenient cleaning.