I got 3 of those bags last year. Sold 2. The first one I got was a HUGE one. I had heard that they had run out and had substituted bags. The other 2 I got were just regular range bags for 1 pistol. I was disappointed that they all were not the huge duffel bag size type that I got the first time.
Just hand write on the slip that "S&W customer service was contacted, and it was stated that Walther P99 purchases qualify for the free bag."
That is what I did all 3 times.