What is a Car Rear Window Campaign? MyBump Media March 05, 2019 10:03 A Car Rear Window Campaign is one of the ways you can earn with MyBump Media. Endorse a brand/campaign by placing a campaign sticker on the rear window of your car. Here's an example by one of our awesome brand ambassadors for a JPJ campaign: Related articles I want a Car Rear Window Campaign, what should I do? What kind of sticker does MyBump Media use? Comments 0 comments Please sign in to leave a comment.