BMW Z4 Roadster Owner's Handbook Manual page 248

CONTROLS
Side storage compartment,
left
There is a storage compartment on the left side
of the boot.
Through-loading system
Principle
The through-loading system makes it possible to
transport lengthy objects, for example skis.
Opening the through-loading
system
1. Slide the net down. Take hold of the net as
close to the edge as possible, next to the
bracket. There will be initial resistance to
overcome.
2. Pull the handle and fold the cover down.
248
Boot
3.
Online Edition for Part no. xxx - X/18
In the boot: open the cover fully. The cover is
fixed by a magnet.