GMC 2005 Envoy Owner's Manual page 131

Lower Position
The panel can be stored in the lower position with
either side up. Insert the front corners of the panel into
the lower guides and slide the panel forward. Press
down on the back of the panel to lock it in place.
Notice: Loading objects that weigh over
200 lbs (90 kg) onto the panel may cause damage.
Repairs would not be covered by your warranty.
Do not load heavy objects on the panel.
Vertical Position
Plastic grocery bags can be attached to the hooks
on the panel. Insert the front corners of the panel into
the vertical guides behind the seatbacks and slide
the panel down.
Notice: If you use the panel as a barrier for large
objects in the cargo area while the seatbacks
are folded down, the panel may be damaged.
Do not use the panel as a barrier between large
objects in the rear cargo area and the seating area.
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