Could have been one or two of the elite cases I had put pics up of. They have a grey interior. They’re more like a laptop bag than a true “backpack” if that matters. I also have the 5.11 sling bag that was made for carrying an MP5 and allowing quick deployment. Looks like a 1-strap backpack and sometimes comes with a “Fanny pack” style holder for a pistol on the strap.