Jeep 2005 Grand Cherokee - Manual (Page 152)

3. The liftgate may be opened with the cargo cover in
place.
WARNING!
In an accident a cargo cover loose in the vehicle
could cause injury. It could fly around in a sudden
stop and strike someone in the vehicle. Do not store
the cargo cover on the cargo floor or in the passenger
compartment. Remove the cover from the vehicle
when taken from its mounting. Do not store in the
vehicle.
Rear Cargo Cover
152 UNDERSTANDING THE FEATURES OF YOUR VEHICLE