Bungee cargo net on the top of my rack. The bracket that came with it was attached to a bike I sold probably 2 bikes ago. Whoops. Didn't really keep the lock in anyway on any decent bumps.
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Bikes: 1996 Eddy Merckx Titanium EX, 1989/90 Colnago Super(issimo?) Piu(?), 1990 Concorde Aquila(hit by car while riding), others in build queue "when I get the time"