Nalgene's everyday line is made of Eastman Tritan copolyester, and is BPA Free. It is dishwasher safe (top rack only) Just make sure the cap does not touch the heating element. These Nalgene bottles have superior impact resistance and are suitable for both warm and cold beverages. The convenient loop-top design means you'll never lose the lid. The narrow mouth bottle is easy to drink from. It is marked with milliliters and ounces for easy measurement.