Doc link above looks good. I would certainly go along the ppf route as they have matt versions and the matt of your bags will still be there. If you go down the 3M Helicopter tape, whilst much tougher and harder wearing its shiny on its own and would stand out.
Just seen your comment re rolls. Ppf is sold as rolls on Ebay. And the best thing is , if you dont like the effect, you can just remove it.
This type of thing , just the first link I tried, click for different sizes.