The pouch size, shape and depth is the same throughout the sizes. Any reference to size is based on the waistband size and the size of the body of the garment and has no bearing on the size of the pouch. This being said, wearing a size smaller will result in a more fitted feeling in the pouch as the remainder of the garment is pulled tight around the body and therefore pulls the pouch tighter as well, conversely wearing a size larger will result in a more loose feeling in the pouch as the remainder of the garment is loose around the body and nothing pulls on the pouch.