The updated Wide Mouth water bottle from Nalgene features a wide opening and very high quality construction, available in various colors and made in a much more environmentally friendly way. Its construction is made of 50% recycled plastic. It is 100% leak-proof without an O-ring or other sealing components. By unscrewing the cap, it is very easy to clean and refill the bottle. The diameter of the bottle is 53mm and the capacity is 1000ml. The Sustain bottle is manufactured in the USA from 50% recycled materials! Nalgene bottles are ideal to keep in your backpack or in your bag at the office every day. They are also perfect for your hikes and travels, as they are very durable.