The dimensions of the Nalgene OTG 24 oz Bottle are: 9.5 inches tall x 2.75 inches wide. The bottle is made from Tritan rather than HDPE. Tritan is the brand name for copolyester, a tough, BPA-free material that has similar properties to common plastics such as polycarbonate. Tritan has chemical resistance and maintains its integrity in environments where other materials may degrade. Products made from Tritan can have the look of glass—without the weight and with more durability.