N-Gen Bottle is the Next Generation of Nalgene bottle. This bottle has 53 mm opening, making it right between the current wide mouth and narrow mouth. The cap features a molded in loop, providing a convenient spot to clip or a nice finger loop for simple.

Technical Specifications
The N-Gen can withstand temperatures from -135ºC (-211ºF) to 135ºC (275ºF) and is Dishwasher Safe (top rack only)