Volvo 2007 S80 Owner's Manual page 176

There is a hatch in the right section of the rear seat backrest that can be opened for transportation.
Fold the right backrest forward.
Release the hatch in the rear seat backrest by sliding the catch up while folding the hatch forward.
Return the backrest to the upright position with the hatch open.
Use the seat belt to prevent the load from moving.
WARNING
Always secure the load to help prevent it from moving in the event of sudden.
Switch off the engine, apply the parking brake and put the gear selector in P when loading and unloading the
vehicle.
NOTE
If the vehicle is equipped with the optional integrated booster cushion, fold it out first.
181
05 During your trip
Loading
The cover on the rear seat armrest/child seat has no hinge. The cover must be removed before the ski hatch is used.