The design is fitted with Contigo's patented AUTOSPOUTßtechnology which allows for convenient single-handed drinking. Push the AUTOSPOUTßbutton and the spout flips open. No biting on the spout is required. There's a special locking mechanism to keep users from accidentally pressing the AUTOSPOUTßbutton. A carabiner clip makes it easy to clip the bottle to your bag or belt. This water bottle is made of a durable and innovative plastic, TritanTM. Odourless, stainless and 100% BPA-free.