So I was driving with my parents in the CX-5 today. Rarely have anyone in the back seat and never noticed noise, but today I did have poeople in the back. My mom commented asking what that noise was? I asked her to explain it and she said it sounds like when your making popcorn lol. My dad looked in the back and saw the cargo cover bouncing (while latched to the rear window) saying that was what was making noise. I slowly started to hear it as i tried to focus on it. Does anyone elses make noise?