Two sizes are available. Small size measures 16x3.9x9 inches (LxWxH), recommended max weight approximately 6lbs. Medium size measures 18x5.1x10.5 inches (LxWxH), recommended max weight approximately 12lbs.
Adjustable strap measures 37-46 inches long. fits small to the large-sized person
For more size details please refer to the picture.