BMW K 1300 S Rider's Manual page 79

Also press locks 3 of lock
straps into locking devices 2
until they engage.
Adjusting case volume
Only close case lid.
Press lock straps 1 outward
and pull upward.
The maximum volume has
been set.
Close lock straps.
Press case lid against case
body.
The case volume is adapted to
the contents.
Removing case
Turn lock barrel into RELEASE
position.
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