Mercedes-Benz 2006 C 55 AMG Operator's Manual page 251

Controls in detail
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5 Button
Open trunk lid.
Press button 5.
The flap opens downward.
250
From trunk, slide skis into ski sack.
Warning!
The ski sack is designed for up to four pairs
of skis. Do not load the ski sack with other
objects.
Always fasten the ski sack securely. In an
accident, an unfastened ski sack can cause
injury to vehicle occupants.
6 Strap
Tighten strap 6 by pulling at the loose
G
end (arrow) until the skis in the ski sack
are tightly secured.