I second this. I have a red Wilson tennis racket bag that easily fits my 7" 300BLK PDW with 2 spare mags. I don't use it often, but if discretion was needed, it make a great discreet carry option.
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A friend uses a tennis racket bag. I use a small gymbag with the Nike logo on it. I have to seperate the upper/lower, but it holds both, a single point sling, at least half a dozen mags, and a fixed blade knife in the side pocket. Has both carry handles and shoulder strap.
While either is certainly discreet in your vehicle, the gymbag, I think, is more universal. A tennis racket bag is out of place anywhere but the court.
I also have a B&T tp9 sbr. I have a laptop bag it fits in, with the suppressor and about 6 mags. Still holds a laptop and cord. Seperate compartments, so taking out the laptop doesn't expose the gun.