RATTLE COMING FROM REAR PASSENGER AREA WHEN DOING 60mph or more

[Mary1938]

Hi there
I've got a 2013 B200 1.8 CDI BLUEEFFICIENCY 7 Speed auto.
The problem I've got is when I reach 60mph or more you can hear a rattle what sounds like it's coming from the rear passenger area.
I've checked all the seats and there's nothing trapped, checked all door pockets and the underfloor storage in the boot and nothing.
It only does it when you reach 60mph doest do it if you do below 60.
Car goes well and is so smooth.
Can you please help me
I've attached a pic of my car.

 

[dry run]

Welcome

A good start - Get someone to sit in the back as you drive to get a more accurate idea of where it's coming from.

 

[brandwooddixon]

As above, have someone in the back. I find rattles can sometimes be difficult to accurately determine front or back or location from the drivers seat when moving.

Does the rattle reduce once over 60mph?

Is there any movement in the rear hatch when closed?